It says now in /bentobox manage that the version is running on a compatible server version. I think the problem is with SkyBlock and Acid Island cause they still don't start up on server start up. Maybe its one of the other plugins conflicting with it.
I use the following plugins:
BentoBox, BentoBox Skyblock and BentoBox Acid Island
EssentialsX, Essentials Chat,
FastAsyncWorldEdit
Holographic Displays
Luckperms
Mines
Vault
World Guard, World Guard extra flags
Thanks for looking into this for me.