Information

Environment information
Plugin + server version info:

https://i.gyazo.com/223a6ca981d72c3b0bf57b573f9158c1.png

Online mode: yes

BungeeCord: no

Server/crash log
None

Plugin config (optional)
Defines the max amount of columns for a backpack.
The size of the user's backpack will be defined by the permission, permissions for bigger backpacks than this value will be ignored.
Can be set to anything > 0. Backpacks with more than 6 columns will have a broken UI! Sizes bigger than 9 may not work with all permission plugins.
MaxSize: 9

Details

Description
I have backpack.size.6 assigned to all players so they can have a double virtual chest, but they only see a 1-row inventory.

Expected behavior
https://i.gyazo.com/775dfa717dafaa1af5f134bf5465d737.png

PD: Mods can't open other player's backpacks, even they have the permission.

https://i.gyazo.com/282f3313f9eaf265d0f2ecc0691d179a

https://i.gyazo.com/282f3313f9eaf265d0f2ecc0691d179a.png

Which permission plugin are you using?

Luckperms

Please run this command and share the output with me: /lp tree backpack <playername of an online player that does not have the correct bp size>

Even if they don't have permissions to open the backpack right now, I think it should work (the size).

https://i.gyazo.com/c8544598afc87563076f44ca14761601.png
https://i.gyazo.com/8316c8c743c0ddcd7791019b73f93541.png

Could you please rerun the command on someone that has the permission to open it.

Same output, but backpack.use is true

I am sorry, I am unable to reproduce this.
Can you please share the list of installed plugins and your luckperms permission config with me, so that I can perform more in-depth testing.

Np, I could solve it. I was lacking the permission node backpack.use

The backpacks got their normal size when opened by the players.