REGRESSION: MASSIVE handle leakage in "System" process while doing "nothing"

See video react-69312-massiveHandlingLeakWhileDoingNothing.webm

I guess this regression is pretty fresh

Nothing is generated within log-files....

69285 is still ok
69292 is still ok
69293 is still ok
69294 broken -> GUILTY (this time for real) react-r69294-guilty.webm
69296 broken
63900 broken