If there is a good way to set the theme in the command line we could recreate a scheduled task that does this. That may work for those who are broken.So far, Catalina is actually running better than Mojave had for me in the last few weeks. I wasn't able to pull up Messages in Mojave at all, but I've been able to access everything without issue in Catalina. So grateful for all the hard work put into the patches.
The only question I have is the automatic theme doesn't seem to be working. Is that something I can address in settings?