All the eggs lack the forge:eggs tag, and the minecraft:eggs tag doesn't exist by default. Would be nice if they had the forge tag so recipes could easily use them (not sure if this was intentional, so i wanted to mention it just in case it wasn't).
Items tagged with forge:coins/iron, forge:gears/iron, forge:dusts/iron, forge:plates/iron, forge:rods/iron, and forge:nuggets/iron should get the ferromagnetic tag (also applies to Steel and Netherite. Any Cobalt items with these tag variations should receive the ferromagnetic tag as well).
Quark's various Raw Iron blocks should have the block and item version of the ferromagnetic tag
Mod support
I'm not sure how in-depth you want to go for mod support (I'd personally say as much as possible - at least for the ferromagnetic tag and a few others), but I got a short list of mods that could use the various custom tags this uses:
Ferromagnetic
Outer End's various Cobalt blocks & items
Regions Unexplored's Cobalt Obsidian
Gloomoth/Underzealot
It seems like the Underzealot only targets torches (or anything with 14+ light level), but if these could at least have the Gloomoth tag it'd be nice
Buzzier Bees (Honey Lamp)
Deeper Caves' various lamps & lanterns
Galosphere's various lamps
Phantasm's Purpur Lamp
Outer End's various lamps (and all the Cobalt stuff having the ferromagnetic tag would be nice too)
XyCraft: World's torches & lamps
Quark's various lamps & lanterns
Regions Unexplored's Hyacinth Lamp
Upgrade Aquatic's various torches, lamps, and lanterns
I added an extra comment to the first issue I made as well, but just in case you didn't see it I'll paste it here:
The Magnetic Levitation Rail doesn't have the minecraft:rails tag
And the Magnetic Light and Froglight from this mod don't have the Gloomoth block tag.
Guano redstone has the lapis tag:
Some suggestions
forge:eggstag, and theminecraft:eggstag doesn't exist by default. Would be nice if they had the forge tag so recipes could easily use them (not sure if this was intentional, so i wanted to mention it just in case it wasn't).forge:coins/iron,forge:gears/iron,forge:dusts/iron,forge:plates/iron,forge:rods/iron, andforge:nuggets/ironshould get the ferromagnetic tag (also applies to Steel and Netherite. Any Cobalt items with these tag variations should receive the ferromagnetic tag as well).Mod support
I'm not sure how in-depth you want to go for mod support (I'd personally say as much as possible - at least for the ferromagnetic tag and a few others), but I got a short list of mods that could use the various custom tags this uses:
Ferromagnetic
Gloomoth/Underzealot
It seems like the Underzealot only targets torches (or anything with 14+ light level), but if these could at least have the Gloomoth tag it'd be nice
I added an extra comment to the first issue I made as well, but just in case you didn't see it I'll paste it here:
The Magnetic Levitation Rail doesn't have the
minecraft:railstagAnd the Magnetic Light and Froglight from this mod don't have the Gloomoth block tag.