This is so incredibly frustrating. I did the update because I was so tired of being reminded every day. I figured it's been so long that I had ignored the notifications I thought it would be safe to do, and sure enough...garbage! I have been experiencing issues for a long time, including when I upgraded my Maschine software, the sampler stopped working. I haven't been able to sample any audio from the inputs since. Logic's issues are that many plugins have now quit, or are not even recognizable. Every export I do reacts in a different way. Podcasts application opens automatically when exporting audio to iTunes. After which, you need to close Logic down so that you can run a search to find your song, then you must open the song to have it open in iTunes which is another story of disaster in its own. Very annoying!
Long story short, DO NOT UPDATE TO CATALINA IF YOU ARE USING LOGIC!