I have the same problem. Did you receive any answers ?
Unfortunetly, and as usual concerning anilmate/flash, no answer from Adobe team.
It's so disappointing. Thank you for your answer.
It's a known issue in AA 20 on Catalina.
A quick search on these forums whould have shown you plenty of threads just like yours.
A known issue, sure, but is it being worked on? When can we expect an update on this? It's been months...
Animate 20.0.2 has the problem fixed. Please update to the latest version.