Hi. The MCPE-155509 describes some way the issue I exposed here. It was difficult to me to show properly the problem, but that ticket describes it better. Thanks for the attention.
Hello. I have same issue playing with my girlfriend on mobile. She plays using a Xiaomi Poco X3 NFC and I'm playing using a Samsung Galaxy A52. We are both playing over the same Wi-fi network at home and I get disconnected every time I try to access to her world. It's bothering me a bit but I think this is a recent issue due to previous version we have not this problem.
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The problem occurs when double tapping forward trying to swim. The player sinks unless he is facing the surface. This issue is more complex on touch devices due to low FOV and small screens. Underwater swimming mechanics are broken on mobile.
The other problem is when crossing one block water deep, in which the player apparently "walks".