Description

If someone has a Permission, but then gets it again for a short time by being assigned to a group for a short time, and then the group is removed from him after that time, then he no longer has the permission.

Proposed behaviour

An option in the Config. If you set it to "true" and then someone has a permission and gets it again by being assigned to a group, then he still have it after the time has elapsed.

If the option is set to "false", everything is as it is now.

I don’t understand what you mean.

Also be so kind and explain your use case.

Oh, I'm only now finding out that you can't add someone to a group for a short time. This can only be done with Permissions. Then I just make an extra issue for it.

This is the temporary modifier value that you can add to the end of a permission so it accumulates on the time instead of replacing. I believe the table can be found here explaining what temporary modifiers do https://github.com/lucko/LuckPerms/wiki/Command-Usage:-Parent#lp-usergroup-usergroup-parent-addtemp-group-duration-temporary-modifier-context

You still haven't explained it any better, nor your use case.

Assigning a group to a player (temporary or not) never copies the permissions over.
If you want a permission to persist, just assign it to the player directly.