1.21.5 issues with displays

Hi there !
I'm actually working on the transition of my global minigames datapack from 1.21.4 to 1.21.5 and experiencing some strange issues i never had before. I took 3 videos examples cauz i think it's only a visual problem. The code is the SAME on both versions, except the equipment and stuff like that, but nothing about displays. 
On Firecircle : for no reason, the flames displays get a shadow on 1.21.5 it doesn't encounter on 1.21.4
On Minesweeper : durations are the same, but tiles on 1.21.5 take a wayyyy longer time to setup correctly than on 1.21.4, but still playable. you can see at the END of the 1.21.5 record the tiles finally rotate correctly
On Pacman : as the green ghost rotation is correct (cauz he goes forward), it seems he doesn't look on this direction on 1.21.5
I'm pretty sure i'll find others situations of this type on my others minigames... Do you have any idea what is happening ? I insist the fact the code didn't change on theses points, so maybe this is a paper build issue or else...
The 1.21.4 games are on a hosted Minestrator server, and my 1.21.5 testing zone is on a local server, this could be a point too