What you were trying to do:
Gently test the new UDL vision restriction.
What happened: Any area covered by vision becomes pixelated. GM Layer items within the vision become invisible.
Night Vision Off

Night Vision On - Unrestricted

Night Vision On - Restricted
Note the partial obfuscation of the area label which is on the GM Layer.

Not sure if related, but light emitting tokens affects GM Layer item Opacity
Steps to Reproduce:
1. Load any game
2. Have multiple tokens, perhaps items on the GM Layer.
3. Enable UDL.
4. Observe pixelation.
Browser & OS info:
Chrome Version 83.0.4103.116 (Official Build) (64-bit)
Windows 10 Home v1909 Build 18363.900
Is WebGL supported by your browser?
Please visit https://webglreport.com/ and copy/paste the WebGL1 report from there.
Platform: Win32
Browser User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Context Name: webgl2
GL Version: WebGL 2.0 (OpenGL ES 3.0 Chromium)
Shading Language Version: WebGL GLSL ES 3.00 (OpenGL ES GLSL ES 3.0 Chromium)
Vendor: WebKit
Renderer: WebKit WebGL
Unmasked Vendor: Google Inc.
Unmasked Renderer: ANGLE (NVIDIA GeForce GTX 1050 Ti Direct3D11 vs_5_0 ps_5_0)
Antialiasing: Available
ANGLE: Yes, D3D9
Major Performance Caveat: No
Vertex Shader
Max Vertex Attributes: 16
Max Vertex Uniform Vectors: 4095
Max Vertex Texture Image Units: 16
Max Varying Vectors: 30
Best float precision: [-2127, 2127] (23)
Max Vertex Uniform Components: 16380
Max Vertex Uniform Blocks: 12
Max Vertex Output Components: 120
Max Varying Components: 120
Transform Feedback
Max Interleaved Components: 120
Max Separate Attribs: 4
Max Separate Components: 4
Rasterizer
Aliased Line Width Range: [1, 1]
Aliased Point Size Range: [1, 1024]
Fragment Shader
Max Fragment Uniform Vectors: 1024
Max Texture Image Units: 16
float/int precision: highp/highp
Best float precision: [-2127, 2127] (23)
Max Fragment Uniform Components: 4096
Max Fragment Uniform Blocks: 12
Max Fragment Input Components: 120
Min Program Texel Offset: -8
Max Program Texel Offset: 7
Framebuffer
Max Draw Buffers: 8
Max Color Attachments: 8
Max Samples: 8
RGBA Bits: [8, 8, 8, 8]
Depth / Stencil Bits: [24, 8]
Max Render Buffer Size: 16384
Max Viewport Dimensions: [32767, 32767]
Textures
Max Texture Size: 16384
Max Cube Map Texture Size: 16384
Max Combined Texture Image Units: 32
Max Anisotropy: 16
Max 3D Texture Size: 2048
Max Array Texture Layers: 2048
Max Texture LOD Bias: 2
Uniform Buffers
Max Uniform Buffer Bindings: 24
Max Uniform Block Size: 65536
Uniform Buffer Offset Alignment: 256
Max Combined Uniform Blocks: 24
Max Combined Vertex Uniform Components: 212988
Max Combined Fragment Uniform Components: 200704
Supported Extensions:
EXT_color_buffer_float
EXT_disjoint_timer_query_webgl2
EXT_float_blend
EXT_texture_compression_bptc
EXT_texture_compression_rgtc
EXT_texture_filter_anisotropic
KHR_parallel_shader_compile
OES_texture_float_linear
WEBGL_compressed_texture_s3tc
WEBGL_compressed_texture_s3tc_srgb
WEBGL_debug_renderer_info
WEBGL_debug_shaders
WEBGL_lose_context
OVR_multiview2
To see draft extensions in Chrome, browse to about:flags, enable the "Enable WebGL Draft Extensions" option, and relaunch.
WebGL 2 Functions Implementation Status:
88 of 88 new functions implemented.
copyBufferSubData
getBufferSubData
blitFramebuffer
framebufferTextureLayer
getInternalformatParameter
invalidateFramebuffer
invalidateSubFramebuffer
readBuffer
renderbufferStorageMultisample
texStorage2D
texStorage3D
texImage3D
texSubImage3D
copyTexSubImage3D
compressedTexImage3D
compressedTexSubImage3D
getFragDataLocation
uniform1ui
uniform2ui
uniform3ui
uniform4ui
uniform1uiv
uniform2uiv
uniform3uiv
uniform4uiv
uniformMatrix2x3fv
uniformMatrix3x2fv
uniformMatrix2x4fv
uniformMatrix4x2fv
uniformMatrix3x4fv
uniformMatrix4x3fv
vertexAttribI4i
vertexAttribI4iv
vertexAttribI4ui
vertexAttribI4uiv
vertexAttribIPointer
vertexAttribDivisor
drawArraysInstanced
drawElementsInstanced
drawRangeElements
drawBuffers
clearBufferiv
clearBufferuiv
clearBufferfv
clearBufferfi
createQuery
deleteQuery
isQuery
beginQuery
endQuery
getQuery
getQueryParameter
createSampler
deleteSampler
isSampler
bindSampler
samplerParameteri
samplerParameterf
getSamplerParameter
fenceSync
isSync
deleteSync
clientWaitSync
waitSync
getSyncParameter
createTransformFeedback
deleteTransformFeedback
isTransformFeedback
bindTransformFeedback
beginTransformFeedback
endTransformFeedback
transformFeedbackVaryings
getTransformFeedbackVarying
pauseTransformFeedback
resumeTransformFeedback
bindBufferBase
bindBufferRange
getIndexedParameter
getUniformIndices
getActiveUniforms
getUniformBlockIndex
getActiveUniformBlockParameter
getActiveUniformBlockName
uniformBlockBinding
createVertexArray
deleteVertexArray
isVertexArray
bindVertexArray
Game Link:
https://app.roll20.net/campaigns/details/7666222/the-show-must-go-on
Game Settings
Game background image was changed. All others unchanged.
Map Settings
Using UDL
No Explorer Mode
Daylight mode was on. Issue does not persist with Daylight mode off.
Token Settings
No light, just Night Vision on one token.
Do you have Hardware Acceleration turned On or Off in your browser or system:
On
Speedtest Results

Console Log
(index):13 Refused to execute inline script because it violates the following Content Security Policy directive: "script-src 'self' 'unsafe-eval' 'sha256-dm6tOb8rwEmENe5+ec26sQvlH6Xd1CBZ7IvtZ4kJ1og=' 'sha256-jlxVUPsj/qdPM120UwbjpC4Tw7dq+obb7SYUV+lSfrI=' 'nonce-jEULOBr8Sjkrgo4e' http://cdn.inspectlet.com https://*.googlesyndication.com https://*.doubleclick.net https://partner.googleadservices.com https://www.googletagservices.com https://ssl.google-analytics.com https://www.google-analytics.com https://ajax.googleapis.com http://ajax.googleapis.com https://d3clqjduf2gvxg.cloudfront.net https://cdn.firebase.com https://*.firebaseio.com https://*.tokbox.com https://*.opentok.com http://static.opentok.com http://www.google-analytics.com http://cdn.crowdin.com https://crowdin.com http://stun.l.google.com *.sentry-cdn.com". Either the 'unsafe-inline' keyword, a hash ('sha256-pTNkp50U6tVf8FuQzTMh762+Nza6SP/j648+XWvdL+s='), or a nonce ('nonce-...') is required to enable inline execution.
jquery.migrate.js:20 JQMIGRATE: Logging is active
app.roll20.net/:15 CAMPAIGN ID: 7666222
(index):325 Logged in - checking Account GDPR status: true
app.js?1593730651:552 70
app.js?1593730651:553 Custom Sheet Translation
app.js?1593730651:557 TOUCH SUPPORTED: false
app.js?1593730651:557 USING WEBGL ACCELERATION...
app.js?1593730651:557 WEBGL STARTUP SUCCESS
app.js?1593730651:575 Loading Custom character sheet.
app.js?1593730651:575 Including compendium template css.
tutorial_tips.js:7 tuts loaded
sheetsandboxworker.js?1593788161947:682 Starting up WEB WORKER
icon.png:1 Failed to load resource: the server responded with a status of 403 (Forbidden)
(index):417 Refused to load the script 'https://js-agent.newrelic.com/nr-1167.min.js' because it violates the following Content Security Policy directive: "script-src 'self' 'unsafe-eval' 'sha256-dm6tOb8rwEmENe5+ec26sQvlH6Xd1CBZ7IvtZ4kJ1og=' 'sha256-jlxVUPsj/qdPM120UwbjpC4Tw7dq+obb7SYUV+lSfrI=' 'nonce-jEULOBr8Sjkrgo4e' http://cdn.inspectlet.com https://*.googlesyndication.com https://*.doubleclick.net https://partner.googleadservices.com https://www.googletagservices.com https://ssl.google-analytics.com https://www.google-analytics.com https://ajax.googleapis.com http://ajax.googleapis.com https://d3clqjduf2gvxg.cloudfront.net https://cdn.firebase.com https://*.firebaseio.com https://*.tokbox.com https://*.opentok.com http://static.opentok.com http://www.google-analytics.com http://cdn.crowdin.com https://crowdin.com http://stun.l.google.com *.sentry-cdn.com". Note that 'script-src-elem' was not explicitly set, so 'script-src' is used as a fallback.
r @ (index):417
app.js?1593730651:566 Final page load.
app.js?1593730651:564 Auth'ed.
app.js?1593730651:564 Go post auth!
app.js?1593730651:564 initial setup
app.js?1593730651:564 joining game...
16app.js?1593730651:561 Full load page!
app.js?1593730651:564 We have 16 pages
app.js?1593730651:562 Player -M912QIWcd6vwnFpDQH4 is offline...
app.js?1593730651:562 Player -M913S1TTprRe2mhbpr- is offline...
app.js?1593730651:562 Player -M9EQL6AjfcoGeOa612h is offline...
app.js?1593730651:562 Player -M9_GQP5bgokcaYDiytb is offline...
app.js?1593730651:562 Player -M9pM-CX1v1-UEKz2Sw8 is offline...
app.js?1593730651:564 Deferred finish joining...
app.js?1593730651:552 Firebase Online
50app.js?1593730651:574 Error while checking for roll total...
s3.amazonaws.com/files.d20.io/marketplace/1209023/oSeHVdpkgL5_FBqP1nG6Vw/thumb.png?1586560547&15898435685:1 Failed to load resource: the server responded with a status of 403 (Forbidden)
app.js?1593730651:552 Error loading graphic, probably due to CORS. Trying once without CORS for https://s3.amazonaws.com/files.d20.io/marketplace/1209023/oSeHVdpkgL5_FBqP1nG6Vw/thumb.png?1586560547&1589843568
(anonymous) @ app.js?1593730651:552
thumb.webp:1 Failed to load resource: the server responded with a status of 403 (Forbidden)
s3.amazonaws.com/files.d20.io/marketplace/1209023/oSeHVdpkgL5_FBqP1nG6Vw/thumb.png?1586560547&15898435681593788173809:1 Failed to load resource: the server responded with a status of 403 (Forbidden)
app.js?1593730651:552 Second load attempt failed for https://s3.amazonaws.com/files.d20.io/marketplace/1209023/oSeHVdpkgL5_FBqP1nG6Vw/thumb.png?1586560547&15898435681593788173809
s @ app.js?1593730651:552
11app.js?1593730651:558 Debounced init page!
jquery.migrate.js:39 JQMIGRATE: jQuery.fn.attr('checked') may use property instead of attribute
migrateWarn @ jquery.migrate.js:39
jquery.migrate.js:41 console.trace
migrateWarn @ jquery.migrate.js:41
Pathfinder2ByRoll20.js:451 Pathfinder Second Edition by Roll20: Alayern's character, version 3.4
Pathfinder2ByRoll20.js:451 Pathfinder Second Edition by Roll20: Light Source, version 3.4
thumb.webp:1 Failed to load resource: the server responded with a status of 403 (Forbidden)
4app.js?1593730651:558 Debounced init page!
base.js?1588774597:45 undefined
jquery.migrate.js:39 JQMIGRATE: jQuery.fn.error() is deprecated
migrateWarn @ jquery.migrate.js:39
jquery.migrate.js:41 console.trace
migrateWarn @ jquery.migrate.js:41
base.js?1588774597:45 undefined
app.js?1593730651:558 Debounced init page!
DevTools failed to load SourceMap: Could not load content for https://app.roll20.net/js/d20/underscore-min.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
app.js?1593730651:555 Uncaught (in promise) Destroyed
deinitialize @ app.js?1593730651:555
deinitPage @ app.js?1593730651:554
switchPageByIndex @ app.js?1593730651:564
switchPageById @ app.js?1593730651:564
(anonymous) @ app.js?1593730651:570
dispatch @ jquery-1.9.1.js:3074
elemData.handle @ jquery-1.9.1.js:2750
nrWrapper @ (index):417