You should just update your server version at this point, no updates to this plugin will be done if anything is broken

MINECRAFT 1.21.4 ONLY JAVA 21+ ONLY

Fixes the universal bundle dupe by rate-limiting bundle actions.

you can set the packet limit in config.yml
you can edit messages in messages.yml

permission: bundledupefixer.alert
Alerts the person about the dupe

this plugin can cause a lot of false flags, setting the packet limit to something less than 15 might work, its more recommended to update to 1.21.8 or later, which has the bug fixed