It seems that some VST3 hosts (Reaper / FL) do not call ExitDll () / bundleExit() which calls DeinitModule () before unloading the dll/bundle!
This leads to crash in some plugins and this is not VST3 Compliant.
We have inform the developers of these hosts…
FLStudio is OK… it calls ExitDll() when all instances are released… (just confirmed with FLStudio dev)