I found a Bug in the latest mod version for Minecraft 1.20.1.
Pickaxes lost their function completly from all other Mods too.
I tested NuclearCraft only and Pickaxes still with no function.
I use simpel a Stoneblock and any Pickaxe and try to break this Block.
no pickaxes give miningspeed and block will not drop like trying to break stone with your hands.
same Issue with other Stoneblocks or ores.
dont testet other Version of the mod only latest.
Edit: i figure out because I downloaded first the latest version (1.2.3-rc) in this case the Bug appears. BUT if I downloaded after I Play with version (1.2.3-rc) and THEN downloaded version (1.2.1-rc) the Bug disappear. after that I downloaded again the newest version (1.2.3-rc) the Bug still dissappear and pickaxes works fine. my theorie is the Issue is in the configs because it dosnt matter if i play the same world or create a new one.

I figure out with the config data from version 1.2.1-rc that bug no longer exist even if I update the version to 1.2.3-rc

This is so weird. It works in my dev env, but doesn't work with regular launcher

how can i upload a video from the bug what i make?

here I uploded it on Youtube: here