When gravity is enabled, Link does not execute his jumping animation... he simply "hops", maintaining the walking animation.
Roc's Feather Bugs in Sideview Mode (b346)
This isn't the first time this has been reported.
What's the status of this bug?
Hint: Link can jump if at least two tiles above him don't have solidity(red marks in ZQ) in the screen with sideview gravity.
If there is no solidity below Link, he will fall.
Have you tried this out, Ebola Zaire?
EDIT: If you mean animations, check Quests > Graphics > Sprites > Link. Look in the Jump tab. Set jumping Link tiles up. Did you import jumping tiles?
So is there a bug, or not?
It is not a bug. I have already seen it myself and it works fine.
All he's got to do is grab the jumping tiles to the tile page, then load the jumping tiles to the Link sprites under the Jump tab. He will have the jumping animation when Roc's feather is used. If he doesn't have any Link jumping tiles, he will have to find them that is identical to the other Link tiles.