How do I access Demiplane Pathfinder2e attributes from Mod API?

I am trying to access character sheet attributes from a Mod Script for Demiplane Pathfinder2e characters.  

I have tried:

•   getAttrByName
• works fine with the Roll20 "pathfinder2eofficial" sheets
• returns undefined for Demiplane "nexus_pathfinder2e" sheets
• findObjs({_type: 'attribute', _characterid: c.id})
• works fine with the Roll20 "pathfinder2eofficial" characters
• returns a list of attributes akin to a token with no character sheet for the "nexus_pathfinder2e" characters 
• even though c.get("charactersheetname") returns "nexus_pathfinder2e"
• getSheetItem(c.id, "fortitude", function(item) { });
• crashes out the script with a "TypeError: Cannot read properties of undefined (reading 'fortitude')"
• I tried a version of  Lord Farquaad's test script for getSheetItem
• responds with "Error fetching hit_points: TypeError: Cannot read properties of undefined (reading 'hit_points')"

• I am running "##########> Sandbox [EXPERIMENTAL 2025-04-09] : Ready fired after 5.15s, 22 objects."
• I have logged into Demiplane in another tab
• I can also see the Demiplane sheet inside Roll20 attached to the token
• I can attach attribute links to the bars
• I can use @{attribute} in macros

Am I missing something?  Is this feature in flux?  I have seen references from Aaron and Keith regarding work on Mod compatibility with Beacon sheets, are the Pathfinder2e Demiplane ones also part of the Beacon sheets?  I haven't seen any reference to using getSheetItem() for Demiplane Pathfinder2e or Starfinder2e sheets.  Any help is welcome.

Demiplane sheets are not currently accessible to the API as far as I know.

Is this correct?  Because the Demiplane Character Integration help document seems to suggest otherwise.  If it is "supposed" to work and is just not working for me, I wonder if it has anything to due with a similar potential bug I am having.  

I am able to access attribute values via @{attribute} or @{selected|attribute} in my macros for Roll20 (pathfinder2eofficial) character sheets, but when I use the same macro on a Demiplane sheet (nexus_pathfinder2e) it only works when I click the "Test Macro" button.  In other words, once I save the macro and try to invoke it by clicking it in the menu bar or by calling it via hashtag, it only works with pathfinder2eofficial sheets.  With nexus_pathfinder2e sheets  it complains that there is no such attribute (I was using perception in my tests which exists on both sheets).  Yet I can access the same attribute by typing the @{selected|attribute} into chat, or by running the same macro with the "Test Macro" button.  It behaves the same in Chrome or Firefox.