Not sure this mod is still being worked on, but Tinker's Compendium seems to have some weird incompatibility with Metallurgy 4.
While the game doesn't crash on startup like it used to in older versions, Compendium items get "deleted" from the game, since loading a pre-existing world with both mods installed will yield the "missing items" warning for those belonging to TC.
Not sure this mod is still being worked on, but Tinker's Compendium seems to have some weird incompatibility with Metallurgy 4.
While the game doesn't crash on startup like it used to in older versions, Compendium items get "deleted" from the game, since loading a pre-existing world with both mods installed will yield the "missing items" warning for those belonging to TC.