Contrary to the 24w37a changelog, Zombies that convert to Drowned do not keep the CanBreakDoors tag.
To reproduce:
/summon zombie ~ ~ ~ {CanBreakDoors:1b}Place the zombie underwater until it converts to a Drowned
/data get entity @n[type=drowned] CanBreakDoorsNotice that the CanBreakDoors tag is 0b, not 1b as expected
There is a small chance the newly spawned zombie will naturally be able to break doors based on regional difficulty, so you may need to repeat the experiment.
Can confirm. I would submit that this behavior is desirable because it would be weird if a mob's ability to break doors was tied to particular circumstances (and would raise the question of whether a converted villager should be able to break down a door in an emergency), so I hope this is resolved as WAI.