The bug
If a rideable entity is leashed to a fence, and you ride away, the lead drops as expected, but the leashknot remains on the fence.
How to reproduce
Lead a tamed rideable entity to a fence.
Ride away from the fence until the lead breaks.
→ ✔ Lead drops
→ ❌ Leash knot remains on the fence
Linked issues
is duplicated by 6
Attachments
Comments 6

Cannot reproduce in 1.14-pre5. The leash does not let me ride away (pulls me back), neither with a pig nor with a horse.

just tested it as well. in 1.13.2 it's still a thing, in 1.14-pre-5 it's apparently fixed.
I suggest marking it as fixed instead of "cannot reproduce", as the long list of versions clearly states that it used to be reproduceable.
I was able to reproduce this in 1.18-pre5. The lead is indeed trying to pull the horse back, however with enough force and using some tricks, I was able to get the lead to break still:
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yes, it's still present in 1.18.2
Affects 24w14a:
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This issue relates to MC-16663.