weirdly bugged light with the updated dynamic lighting

When I try to enclose a building in light blocking walls but so that it is possible to go inside and then see the insides, weird things happen. Light block setup: From outside the building suddenly blocks light upwards on the map at much longer range than expected but lets light through anyway past it? The red arrows point at the weird locations and from inside it fully blocks the light except for one small slice for some reason:

Oh and the browser is: Google Chrome Version 88.0.4324.150 (Official Build) (64-bit) on win 10 pro.  Only adblock installed(and disabled for this test)

The bug is related to vision: As the vision was showing "on". But I turned it off and had the same as above. Then I turned it back on and it was again fine showing what is expected and not the bugged thing above. So now I know next time that turning vision off and then back on can fix things with the lights.