Epilepsy Warning for the GIF.
I think that the change that makes it so players can't cross 1 block gaps has made it so vehicles misbehave too.
To reproduce (Don't do this if you're epileptic)
1. Tame a horse and equip it with a saddle.
2. Either try to run into a block to move up it, or try to cross a 2 block gap.
3. You have moved wrongly.
Linked issues
duplicates 1
Attachments
Comments 2
Thank you for your report!
We're actually already tracking this issue in MC-272075, so this ticket is being resolved and linked as a duplicate.
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Changed the title to horses because Pigs and Striders are unaffected.