BUG: It is not possible to sell potions

[pjindras]

Minecraft version
1.20.1

Plugin version
3.15.2

Describe the bug
When the player has the proper potion, it is still not possible to sell it in the shop, I personally tested it and really there is a bug, could you please check it?

To Reproduce
Try to sell the potions in the dynamic shop.

Expected behavior
The potion should be sold as other items.

Please check it if possible, the plugin is very nice, the best shop plugin.

Thank you!