Jumping with a Horse or similar mobs seems to be more janky compared to before, which when you released jump, the jump would happen instantly without any noticable delay, but now for some reason the jump looks as if the game has lagged whenever you do it.
We're tracking this issue at MCPE-231719, so this report is being resolved and linked as a duplicate.
That report has already been resolved as working as intended, which means this is not considered a bug.
If you haven't already, please search before creating a report to see if the issue has already been reported. See the Bug Tracker Guidelines for tips on searching for issues.
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