Yes, it's certainly not bug free, there are bugs that need to be fixed. Worst persistent one I've had is that a Warlock 4/Sorcerer 8 multiclass I have always tries to upcast all warlock spells (like Hex or Misty Step) with their highest level slot, which are Sorcerer spell slots. Very annoying and not worth.
That said, I would not discourage anyone from getting this game on the basis that it has some bugs. I doubt most new players would know how deal with multiclassing bugs, and probably would be multiclassing in the first place.
Litany