Its very important to delete the "Scripts" Folder when exporting vrca then your sdk will work again. Sadly the Loadbundle script is kinda broken after the 2022 unity update so you gotta do physbones manually. There is a Toolpack called "FACS_Utilities" you can find on github its very usefull for restoring broken animations / menu / Parameter thing and the Animation Controllers.
If you need any more help write me a DM and i can show you step by step how it works if you want.