Perm backpackpro.nodrop not work?

Hello, I have deactivated that permission so that the players lose the backpack on the day of pvp, but it remains. I have tried everything. What I can do?

Changed Status from Pending to Not a Bug

If you want the player to drop items from the backpack when they die
Need to configure "Death dropped backpack items": true,

Set "Death dropped backpack items": true, the player will only drop the items in the backpack
But players with backpackpro.nodrop permission will not

If you want the player to drop items from the backpack when they die
Need to configure "Death dropped backpack items": true,

Set "Death dropped backpack items": true, the player will only drop the items in the backpack
But players with backpackpro.nodrop permission will not

Ok, thanks, it works.
I thought that adding or removing the permission was enough, but I had to activate that.
Thanks! great job!