When a boat falls onto a mob, if the player enters the boat, the player starts slowly falling through the mob, until reaching the ground (or water in the case of the video). The player then teleports back up. The player can destroy the boat while inside it, leading me to believe the game thinks that the player is both in and out of the boat.
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If this is still an issue in 20w49a, please provide a video with the debug screen enabled (hit the F3 key) demonstrating the issue.
I cloned this issue as MC-223515, because I was able to reproduce in 21w15a.
I am unable to reproduce this issue in 20w49a. When a boat is placed on top of an entity, you can ride it without any jittering movement.