Desynching and Feather Falling Broken when using Add-Ons.

I use Craftable Bases and Mob Jetpacks add-ons in my world. After the update the game will desynch randomly causing my player to Die due to falling from a high place because of the desynch. When I place my craftable base it will build your building shoot you up into the air and give you feather falling and you land in front of your new build, now after the update when it launches me in the air, it says I have feather falling but I just crash to the ground and take damage. Never like this before, My world was perfectly working even with the previous updates however after this current update, there’s chunk loading issues, desynching and feather falling not activating properly when using my add-ons.