I argue in this question that damage taken while polymorphed can break concentration. If this damage does break concentration, is it applied to the polymorphed form (just before concentration breaks), or the normal form (just after concentration breaks)?
In other words, if a wizard is polymorphed into a Giant Ape, and takes 50 damage, breaking his concentration, does the wizard (normal form) take 50 damage or not, assuming that 50 damage would not have been enough to spill over the ape's remaining hit points into the wizard's (had concentration not been broken)?
This question is not a duplicate of the one linked above. This one asks whether the damage that breaks concentration carries over into the non-polymorphed form, while the other question asks whether damage taken while in polymorphed form can break concentration.