This new release adds compatibility with Paper 1.21.11 and fixes a couple of issues:

• Previously all jails were saved in a single file, that is bad news if that file is ever corrupted or saved incorrectly which was the case when the plugin failed to load. Now:
  • all jails are saved each in their own file to minimise catastrophe surface area
  • that also means if the plugin fails to load for whatever reason, the jails data will not be overwritten with empty data and will remain intact
• When no jails are present on startup, the plugin will refuse to load prisoner data and print an error on the console on how to proceed

A new metric has been added to bStats: long_version - a combination of server software, server version, and plugin version, to provide more insight on what server platforms and versions updated versions of the plugin is currently being used.

Full Changelog: https://github.com/emilyy-dev/BetterJails/compare/v1.6.2...v1.6.3