I always worry that any wax that melts will freeze in the drain and block it.
Beeswax is soft... Except when it is not. Ever tried squeezing a solid brick of the stuff?
Plumbers / builders use the smallest pipes they can get away with. Round here, the entire street's waste flows down a pipe about as wide as my puny arm. I know, because I've had to pay £££ to get it unblocked when people flush stupid things like wet wipes. I've tried clearing fat blockages down the kitchen pipes with alkali and boiling water - but it freezes in winter and you need to resort to mechanical scraping.
So I would caution against flushing fluids containing wax down a domestic drain.