I keep having the issue that temp permission disappear from the database randomly before they expired.
The action entry is still in the database, just the permission is missing in group_permissions table.

This wasn't an issue before and I have no idea whats causing this issue.

version: LuckPerms-Sponge-4.4.26 and LuckPerms-Bukkit-Legacy-4.4.26
storage-method: mysql

I believe this has most likely been fixed in v5. The system for auditing temporary permissions is now much improved, this kind of data loss should not be possible.

Thank you!

What timeframes are we talking about?

The temp permissions are set around 30 days.

Perhaps an issue with server time being out of sync?

That's my best guess. Could potentially add something to combat this.

Not that I have noticed but I guess it can be out of sync for just a moment, on any server luckperms is running on and cause this.