Disable the swap item which is (F) key when holding a gun or you're not able to put it in the inventory. A small chat message will pop up on the hotbar you're both hands are occupied.

@Zensuyo Can you confirm if this is still an issue with the latest 1.18.2, If so we can create an internal tracker.

Sure will test out the CD latest version

Yes, still does on 1.18.2 juan have screenshot of those on

Probably gonna need a mixin for this one.

@Sm0keySa1m0n Do you have an update on this?

That, my friend, is a very strange question.
Please disable the offhand which is sameone when holding a gun.