As already mentioned in a comment of this bug, the engine for Minecraft Bedrock Edition has a fixed frame delay set which leads to noticeable input delay, more prominent the less frames are rendered.

This is not a V-Sync problem and I wanted to post this here as a seperate issue, since this seems to be overlooked.

To confirm this, I used RivaTuner to set the framerate to 1 FPS. Now it will be made easily visible that every input you do, will be delayed by 4 frames / 4 seconds. Using the ingame framerate limiter and setting it to 10, a similar delay will be noticed between native limit and RivaTuner limit. This problem therefore is clearly an ingame issue that must be fixed for reducing input delays.

In other versions of Minecraft like Java Edition every input update arrives at the very next frame.