I use minetweaker to add custom mutations. When I attempt to make a mutation with industrial hemp seeds from Immersive Engineering (" ImmersiveEngineering:seed ") I get this error:

ERROR: Adding mutation with result 'Industrial Hemp Seeds' failed. All 3 have to be of type ItemSeeds.

There isn't any other message in console, and this only happens with the industrial hemp seeds.

Ah this is a remnant of my old crop system where seeds had to be instance of ItemSeeds, thanks for the report, I'll fix it this evening.