My problem is visualised in this overview of a dummy app that replicates a problem that did not exist until some days ago:

Using:
- Component myComponent with a Custom Property behaviour "onClickTest" (enabled experimental "enhanced component properties")
- MyComponent embedded in a screen in which a variable curVar is set
Problem:
Since some days, when I reference the variable used in the screen, this has "blank" value in the OnClickTest function implementation in the screen.
Current (problem): myComponent_1-> OnClickTest -> curVar = Blank
Previous (Correct): myComponent_1-> OnClickTest -> curVar = "This is the current value of curVar"
Check curVar: see label below the button "set curVar", outputting effectively the bold text string above -> curVar is not blank!
This was definitely not the case before, I have been using many global variables in my real app, that used to work properly but now has the same problem, set to Blank, as replicated here.
Does this look familiar? Any advise on where to look? Or could this be related to a bug in a PowerApps release?
(I do not know where to check the PowerApps release version; I am not admin)
Thanks