When I place down the locksmith and put the lock or key inside the right slot and type in the combination I want to set, the output slot is empty! Nothing happens!
Log File: https://pastebin.com/HbqgVaQx
Image:

Yeah, that seems pretty bad. Should have a release out to fix this shortly.

d3b929b Fixes the dupe bug. Should be out with 4.1.1

Locksmith is actually duping items. Can you please release this on curseforge? I operate my own modpack, and you cannot just put committed files into the pack and upload. Curseforge will deny the upload.

You are completely right! Not sure how this snuck past me in the last update. 0f83150 fixes this and is in the latest version.

Thanks for the quick fix!