According to the Beta rumor mill (I can't divulge how I know this), LM is aware of this problem but cannot reproduce it on their default install. So, it seems we will need to do some detective work to see if we can figure out what the issue is. Here are some questions (feel free to add to the list)...

I reinstalled and updated Win10 2004 a few days ago, vcredist 2015-2019 has been installed first. UAC disabled, P3D folder included in Windows Defender exclusions, Prepar3D.exe is run as administrator. Shortly speaking, I followed all the recommendations according to the AVSIM CTD Guide and suggesti...