I made a simple lemon mead in September.
Test batch for myself: Honey, water, Whole lemon rind and dry yeast (plus feeder). 1 gal.
Fermentation went well, no complaints.
But then I forgot it...Now some 8 months later, I have rediscovered it. Lemon rind still inside.
I racked it off, taste...
Difficult to tell from third photo.
Is it yeast supported by bubbles or a thin waxy like film? Could be lacto infection if the latter.
I'd let it finish and then do a sniff and taste test if your in doubt.
There's loads available on the web about diagnosis via taste and smell if it's picked...