Wierd uncontrolled rotating PT-76B if you drive skew to the water and meanwhile steering into the water.
You can just control the speed but not really the direction (just a bit) of the steering/rotations and if you try to leave the river any strange steering drive you back into the river and you're trapped there.
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M113 is prone to engaging in futuristic tank physics when entering or exiting the water. See videos:
https://youtu.be/D4Y711AxR2w
https://youtu.be/7NJTnOr8BnM
Wheeled vehicles don't appear to be affected. It's also possible that it's related to ponds, as the M113 seemed fine in sea water (e.g. on Malden 2035).