Block or entity functions changes crashes experimental world

Something happend on my experimental world called (world 1.16) when i opened that and do something simple game crashes 

I don't know how 

What i did is

Copy the db file on my world and paste on other world and still getting the same crash

No changes, same crash

Steps how to reproduce 

1. Be sure you have experimental world on previous version 
2. Open the world on latest version
3. Do something simple on that longer or short After that game will crash

HOW IT HAPPEND 

So i found a minecraft version

1.17.10.20 and found out they have axolotl changes

And i open my experimental world

And im going to build something i want

But before im going to build something

The game crashes for no reason

 

 

Here are the videos what happend