Items not returned when GUI is closed

[XenXn]

What steps will reproduce the issue?

1. Put items into GUI and close/esc out of GUI without clicking to sell

What was supposed to happen?

Items should be returned to players inventory

What happened instead?

Items were taken away (sellable items did not sell or return to players inventory)

What version of this plugin are you using?

uShop v2.1.1-SNAPSHOT

What Spigot version are you using? Paste the output of /version below.

This server is running Paper version git-Paper-50 (MC: 1.15.1) (Implementing API version 1.15.1-R0.1-SNAPSHOT)

What plugins do you have installed? Paste the output of /plugins below.

Plugins (29): AAC, AACAdditionPro, AACPlus, Citizens, CMI, CommandDoesNotExist, Companions, ConditionalCommands*, CrateReloaded, EnchantsPlus, HeadDatabase*, Jobs, Lands, LastLoginAPI, LuckPerms, mcMMO, OreAnnouncer, ProtocolLib, Rankup, SelectionVisualizer, UltraCustomizer, UltraRegions, uShop, Vault*, Vouchers, WildStacker, WorldBorder, WorldEdit, WorldGuard

Are any errors related to this plugin in your console or logs? If so, paste below.

paste
error(s)
here

Any additional information that you would like to provide that may be relevant to the issue?