Nostalrius Begins - Quality wow vanilla realm (1.12)

Hello guys, I'm experiencing so many strange bugs like pet name change to unknown, pet ability bar dissapear, can't open ammo quiver. Every time I do /rl I automatically leave world channel I have to /join world all the time and /rl every 10-30min. Questie addon red frames with error all the time along with losing quest marks on the map. And sometimes if I got a quest and have to talk with e.g wind ride master, it opens automatically fly patch to select, I can't even click on quest.

The pet related bugs are the reason why I never roll a petclass on a private server.
Those things even bugged out on retail.

The questie problem is due to the addon not being monitored or being worked on any longer by the developer, so if bugs happen they won't get fixed.