Version 6.2.1:

Fixes

• Fixed issue in the cardinal-components-chunk module causing save failures when no mod actually used said module

  • Unfortunately, any chunk in which the damage happened will be reset. If you have a backup of your world, you should try loading that. Otherwise, I guess this is a reminder that regular backups are critical, especially when adding new mods or updating across Minecraft versions. In any case, my apologies for the damage and the delay in fixing the bug.
            ~ Pyrofab

    PS: if you never got spammed by red popups saying "failed to save chunk", you are most likely unaffected by the issue.

see full changelog here