Parrots on shoulders disappear instead of being dismounted when switching to Spectator mode

The parrots are still there when you switch back to Creative mode, it does not remove them, they are just not being rendered whilst in GM3 but are rendered again upon going into e.g. GM1.

As the parrots have "become a part of the player" (ShoulderEntity) this seems to be intended for me, that they don't get dismounted when you switch to GM3?

You are right, I probably accidentally reproduced MC-114889 with spectator mode.