Here is how to fix the bug by yourself:


Done using behaviour packs and command blocks. 

 
Warnings:
This patch might have some extra visual bugs regarding the player's size.
This patch might cause a little bit more lag than usual.

 

Video:

https://clipchamp.com/watch/Pv1ErHt8vfw

 

Did not attach the behaviour pack due to copyright reasons but you can still install the patch:

1. Download the Size Scaler Addon from https://mcpedl.com/size-scaler-addon/
2. Open the addon with WinRar or a software that opens archives;
3. Replace player.json file in the "entities" folder with the new one attached here: https://drive.google.com/file/d/1KD1NbEQ-L-IrvMqiAqqnr5KnE4hyz88n/view?usp=sharing
4. Open the new addon file with Minecraft and install the behaviour pack;
5. Attach the behaviour pack to your world;
6. Enable all Experiments (Holiday Creator Features; Creation of Custom Biomes; Additional Modding Capabilities; Enable Gametest Framework);
7. Enter your world;
8. Execute command:
           /gamerule commandblockoutput false

9. Set up 2 command blocks like this (one next to each other):

            1. Command:             /event entity @a event:scale_2

                Repeat          Unconditional           Always Active          Delay in Ticks:   7

 

            2. Command:             /event entity @a event:scale_normal

                Repeat          Unconditional           Always Active          Delay in Ticks:   7

10. Stand on top of one of the command blocks and execute command:

           /tickingarea add ~2 ~2 ~2 ~-2 ~-2 ~-2 bugfixcommands

 

This should work and should fix the bug!

Have fun! :)