Application.Shutdown.CleanupMono infinite loop

Last lines in editor.log

[00:00:03] Enlighten: Builtin Sky manager started.
[00:00:04] Enlighten: Finished 1 Bake Ambient Probe job (0.00s execute, 0.00s integrate, 0.32s wallclock)
[LAYOUT] About to save layout E:\Work\EmpireOfEmber\Client\Library/CurrentLayout-default.dwlt
[LAYOUT] About to save layout C:/Users/Kevin Jenkins/AppData/Roaming/Unity/Editor-5.x/Preferences\Layouts\default\LastLayout.dwlt
AcceleratorClientConnectionCallback - disconnected - :0
Cleanup mono

 

Did you report this bug to Unity and if so, is there a case number?

 

Years later, this still is a thing in 2022.1.11f1

Finally did the dreadful move from Unity 5 to first 2021, then 2022 and I'm honestly regretting it. This error persists (among dozens of many nonsensical ones all related to the bloatware this engine received since then.)

I don't even do a thing in the project, no error comes up in the console: save and close and this infinite loop of "cleanup" comes up every time.

What happened to this engine...