I'm not able to activate the quest about the "Induction Smelter", even if I completed all the ones before that one, so I can't continue along the quest book.
I already tried to validate files, exit/enter, create a new game, craft or even give me a bunch of smelters.

oh, that's why! thank you!

Hm, it looks like it also wants you to do the pink dye quest too, based on the directions of the arrows. Admittedly that's a bit confusing and something I should tweak. I'll leave this issue open so I remember to change it.

Request to either put the pink dye in the quest line directly via jaggedly moving the lines around or to remove the pink dye quest.

This has happened a few times on the discord server.

I decided to just remove the pink dye quest in 1.2.14