If your server is on 1.19 you need to get the latest development build of ProtocolLib from their CI (direct link here).

Changes:

• Fixed an issue when using the legacy/bukkit scoreboard handler.
• Added French translation by Naos#5994.
• Made a few small changes to the default config files.
  
• Some internal changes and optimizations.

This update includes features requested by SimpleScore users, if you have anything you would like to see added feel free to reach out to me.