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i am unable to access the super convergence too...
i was still completing the secondary color constelations before the chapter 3 and i saw the button but didn't press it yet, and after i did a normal convergence i couldn't see the Super button anymore...
also, i'm playing browser version (i don't know if that version is different)

Incredible! Can't wait to download and replay everything from the beginning

i don't know if this was pointed out already but the first mastery of Parry and the Wind spell Flensing Ruin give error messages.
both errors apparently are related to damage calculation