The minecart hitboxes are too large which messes up redstone contraptions that require minecarts to be side by side. A minecart beside another will push the other minecart out of the way.
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Can confirm as well, also affects 1.14.1 and 1.14.2, very annoying when trying to make simple minecart unloaders.
You can see a bit of this bug in action here: https://youtu.be/9QVb8NtbU34?t=236
This also prevents multiple minecarts from being next to each other, when inside of blocks. For instance pushing 4 minecarts into a 2x2 of blocks, will always eject one of the carts. This was never an issue before.
(Tested before reported - from 'Technical Bugs List' https://docs.google.com/document/d/1nziKYzCr4pBdCRj2gIMlfr9MVdWHd6HyafdiBHx9F0c/edit)
This issue happens in 1.14.30 hotfix and 1.15.0.51 also.
This bug is fixed in the latest beta version, and the fix will be included in a future update when that is ready for full release (no specific date can be given). We will leave this ticket open as a point of reference until the fix has been fully released.
I can confirm this issue as well. Very annoying and it basically breaks every red Stone contraption built with minecarts in the design.