I installed Catalina on the day it was released to the public, now I've moved on to Big Sur, and during all this time, i.e. during its entire prescribed lifetime, I haven't seen a single bug. That's not fair. I feel left out. ?
I have no doubt that some configurations, and possibly combinations of third-party software, may, under certain specific circumstances, trigger some unexpected behaviour. But to call it 'full of bugs' because of that is exaggerated to say the least.
I hated Windows 10 and thought it was a buggy piece of crap, until I discovered that all my problems were caused by a Lenovo driver. I bet it's the same with Catalina - and any other operating system for that matter.