Refer'd Issue:
https://github.com/svenhjol/Charm/issues/588
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In the update that you released I saw Charm being mentioned and I wonder if perhaps this could be checked out? There's a bug that occurs where if you right-click entities... you will swing your off-hand arm which... doesn't seem to do anything. While this appeared to be a visual thing... it seems that this can cause some modded stuff to break. As far as I know it breaks some of Advent of Ascension's guns,blasters, etc.
I know that Advent of Ascension isn't in RLcraft in the mentioned issue but I dunno if it bugs out with other mods in a way.