I’ve not seen this before so I’m wondering if I may be on the wrong track. This circuit appears to grow into a fairly large structure. Should it do that?
That’s what we call a no-borders merger, and by the size of that bouton (2nd pic) I’d say its from a bipolar cell, if you see in the 1st pic the trace loses its borders into a far larger “area”. That’s the merger and it is advisable not to trace those. For more information on it type !merger in chat in game.