When a wandering trader spawned (right in front of me) he decided to walk in a certain direction and then this weird glitch happened. Not sure why or how it happened but I'll share what i saw. Seed for the world is 6539709202642170530.
MC-153980
Wandering trader leashes freeze in mid air.
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Minecraft 1.14.3 Pre-Release 1, 1.14.4, 1.15.2, 24w06a
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Please check if that's still an issue for you in the latest 1.14.4 stable release or the latest 1.15 development snapshot.