FFS, I just lost a lot of items by updating Mystical Block because it removed colossal chests

as per the title, I updated MB to 2.6 via ATLauncher. There was no indication that a mod (if not multiple, I haven't cross-referenced it yet) was removed from it. I don't even seem to have backups (stupid of me, I know. I've just gotten used to automatic backups I suppose) so that I could revert, reload the world to restore my stuff, close, re-upgrade and add colossal chests back in...

Be careful when updating modpacks. I think I'll need to start looking at the change logs from now on.