When using any of the vanillahammers hammer it'll only mine the middle one of the supposedly 3x3 blocks while still dropping the included blocks allowing you to place cobblestone for example continuously for infinite duplications.

vanillahammers-1.15.2-2.1

Sounds not good :( needs to be the new MoreVanillaLib update..

I'm using morevanillalib-1.15.2-1.2.3 :)

fixed :) ChaoticTrials/MoreVanillaLib@6a12f87

new version available here: https://www.curseforge.com/minecraft/mc-mods/morevanillalib/files/2956872

That was fast, thanks!

It was important! Dupe bugs needs to be fixed as fast as possible!

Agreed, but still :D