May I propose that for E16(Retro) we stick to Buster (at the very least until all major bugs in Bullseye are ironed out) for stability and use E24 as a base on Bullseye?
Bluntly said: I'm proposing a fork.
Seeing as how E16 and E24 don't really mix well.
There goes the "rolling release" concept down the rabbit hole. 
