This mainly seems to be a visual glitch because the hitboxes seem to align normally but carts inside of bubble columns do some funky things.
I think the carts should only tilt there is lateral movement while falling instead of always tilting while falling even when straight down. Or maybe some special rules for water and/or bubble columns because I use a lot of bubble columns to move carts around.
Steps to reproduce:
Build the following setup in a world with the Minecart Improvements experiment enabled:
[media]Place a minecart on the rail and push it into the water
Observed result:
The minecart stays tilted even after it hits the top glass block.
Expected result:
The minecart stops tilting after it hits the top glass block.
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@unknown Definitely related and maybe the same issue, I'm not sure.
Would MC-275229 describe you're issue?