Hey there! Big fan of the datapack, I've been running into an issue with version 1.6 running on a Fabric 1.21 server. I've attached some server logs used during my tests below. The testing for the 12-05 log was done right before the server closed. Thanks so much for your work, it's great!
latest.log
2024-12-05-1.log

Hi there! Took a look at your logs and can't see anything obvious

Do the other items in the mod work? (trowel, chisel, etc..)
Also, what blocks were you testing the hammer with? To note, it will not work with blocks that do not drop items when destroyed, and generally does not work in creative!

Chisel and trowel both work! I am breaking stone and dirt with the hammer to no avail. Is there any more info I could provide that could help?

I've also used the same version on a singleplayer client and it worked fine!
My best guess is one of the server-side mods is interfering with one of the functions from your datapack. I'm not a datapack programmer though so idk lol

A list of all installed datapacks and server-side mods would be appreciated!