Minecraft wiki entry for Development_versions, associated text: Hand animations have been added for the following:
Entering a boat.[37]
Speeding up a baby strider's aging.[38]
Shearing sheep (a regression from 1.15.2).[39]
Feeding a brown mooshroom.[40]
Using a spawn egg on a mob to spawn a baby variant, if there wouldn't also be a block within reach through said mob.[41]
Hand animations for the following have been removed:
Targeting a block through a mob then using a spawn egg.[42]
Attempting to switch a minecart with furnace's direction when it isn't on a rail.[43]
Using a dye on a sheep which already has that color.[44]