Do you have the same issue if you follow the OP’s steps to reproduce it?
• YES
Provide extra information to complete the original description of the issue:
For me, whenever I have the ‘no engine sound’ bug the sim does not close properly using the normal “Quit to Desktop” button. It requires being ended via windows task manager.
Additionally:
I do not know if it is specifically related to aircraft, but once it happens it seems to effect other aircraft - even ones that have worked previously.
I can repro this bug with clear Community folder, BUT if I load with MSFS 2020 aircraft in Community folder and experience the bug again - then swapping to those local aircraft does not fix the issue, I cannot hear the sound when using them either.