Thanks for reporting the bugs!
You are right. Quite a few weapons were messed up, not just the pickaxe. I found the cause and fixed it. Uploading new version right now. It should be compatible with old version so you can simply copy your old save files over and everything should be alright.
As for the broken rock, there are multiple spots like this. I will have to properly comb through all maps in the future since there are quite a lot of those.
Again, thanks for reporting those. It rally helps.