The Mob Crusher doesnt drop any of the items ex, hearts, or withered bones? We tried killing them by hand they drop but with the mob crusher they dont

Despite being coded as "Player Kills", the IF Mob Crusher doesn't have all the player tags to make it applicable.
Mob Grind Utils Mob Masher DOES get the drops, with exponentially higher chances via Looting Modules.

I don't think Joe can fix this particular issue as it's a different mods machine, where as other other "Player Kill" traps function correctly, whether by hand or MGU or other "Fake Player" introduced blocks.