Electron 7 apps have white background in overview grid

macOS 10.14.6
TotalSpaces2 2.8.6
SIP disabled

I’ve noticed that after an app upgraded Electron 4 to 7, the app only showed completely white (see screenshot below - bottom right) when in the overview grid.
Before that the app was shown properly with all elements shown correctly in the overview grid.

I have no idea if this is a bug in TS2, but it might be an indicator. Something changed between Electron 4 and 7, so that this is happening. Who knows, maybe this has a different impact as well.

Does that happen also in mission control?

Nope, it does not.