The bug
Wolves and Ocelots don't play their sitting animation while in Boats or Minecarts. Zombies, Enderman, Skeletons and many others do.
Linked issues
Attachments
Comments 22

Confirmed for 1.9

Still in 1.9.1-pre1

Still in 1.9.1-pre3

Still in 16w15b
Can confirm in 20w48a.
Can confirm in 21w05b.
Can confirm in 21w07a.
Affects 1.20
there is no need to comment when you can update the affected versions yourself