Baby zombified piglin riding on chicken is picked up by a minecart. Then sometimes the minecart gets stuck randomly when going around the corner., No entity collisions.
Video: https://youtu.be/W56aRXIee8E
Sample WDL attached, verified in vanilla 1.20.5 Minecart goes in a cycle, picks up jocket, goes around 2 corners, unloads the passenger and gets broken. Command blocks kill jockey and spawn a new one.
I'd say the problem happens about 1 in 10 or 1 in 20 times. So you may need to run the setup for a bit but eventually it will happen.
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No, I'm confident that specifically chicken jockeys cause the issue, not empty carts and not carts riding certain other mobs (tested with blazes, wither skellies and zombified piglins).
I use this setup a lot in a fortress farm, where jockeys are the rare exception, I have 600 minecarts going around in 8gt intervals on 4 tracks, with each having about 8 of these curves on average, And the setup would sometimes break after hours of operation. So I used replay mod to identify the issue, and it was always a chicken jockey that caused the issue. Compared to hundreds of thousands of empty minecarts and minecarts carrying blazes, wither skellies and zombified piglins (both babies and adults) where this bug did not occur. It took me days of debugging and experimenting and eventually I solved the issue by killing the chickens by dropping all mobs through lava. The farm has ran smoothly ever since (ran it for over 40 hours now). So it were the jockeys, and only the jockeys.
I also ran the world download for hours with empty carts, without issues. Going to chicken jockeys produced the problem almost immediately.
I am recently designing a large scale jockey farm in 1.17, and upon testing, I am strongly confident that this is related to MC-71998. As Jockey can control their cart, their being lost in pathfinding results in this behaviour. Placing turtle egg somewhere in the direction you want the jockey to go can (most of the time) reset their pathfinding after they get stuck for some time.
Would MC-197761 describe your issue? The bug seems to be far more general than specifically chicken jockeys.