I can’t speak for others, but I’m not getting those issues on my system either. I play on official PVE servers, not Single Player though. Server is very busy, new bases popping up all over.
I’ve had a few invisible White Dragons at the end of the Cimmerian Beast Tamers Purge, but no invisible pets anymore for the past few months. It sucks not seeing the Dragons, but the skulls and health bar are there. Maybe I’m more forgiving than others, but for months the Lost Connection issue made Purges impossible, so one invisible NPC isn’t a huge deal for me.
It sounds like the OP plays in single player mode, so I’m not familiar with the issues they encounter.