I was trying to reproduce MC-242015. To do that, I created a new world and immediately teleported to some coordinates:

Seed: 2480881480171786112
Coordinates Tree 1: 2812 66 420
Coordinates Tree 2: 2846 65 416

There was supposed to be an azalea tree at both of these locations, however there weren't any to be found.

I recreated the world and flew to that location in spectator instead of teleporting. Then, both azalea trees were there.

I did not change any world generation settings.

Not sure if this is a new bug or an old one. It's odd this only appears to affect azalea trees for me.