eyes suddenly locked even though i've had him for a while?

i've beaten the throne like 3 times as him, i have his b skin and i have a golden crossbow for him, i play him all the time, but all of a sudden he's locked? like the game crashed with one of the error messages in which you can click abort or cancel on, and now it just tells me i have to reach 2-1 to play as him. i've reached the sewers so many times since this has started happening so i really dont get what is going on here...

oh yeah, no other characters are locked, besides rebel but that's just b/c i haven't looped yet due to not knowing how to on my best runs and having the game straight up not loop me even though i destroyed each generator in the throne fight.

TLDR: eyes is my favorite character but he's randomly locked now and i have no idea to actually unlock him again.

EDIT: strange, but after a few restarts, and then playing as melting i unlocked him. i dont think the character is related to it but i'll leave the post up in case people have the same problem.