I had similar issues, and tried the same to no avail. The only thing that worked was a complete reinstall of the operating system. Am guessing you might need to do the same.
Thankfully it was something else, and I was able to keep catalina.
I refuse to be a QA engineer for apple for no pay. Running one OS version behind has worked really well so far.
That’s a sincere frown. I don’t use Omni’s apps but I’m really disappointed that the high quality of the Mac app ecosystem is basically gone.