Azalea sapling has too many collision boxes

Based on the following video:
https://youtu.be/Rt_hy6FF_P4?si=8JOcj_Cb2Akf0aZa&t=1064

It seems like the azalea sapling has 4 collision boxes for the crown, where 1 would suffice. Similar issues seem to be present for other blocks such as hoppers, anvils and cauldrons.