Stupid figs lol!,I have one in my humidity bin doing the same thing,I've noticed some varieties seem to want to do this more than others,I put it down to humidity,I can see you have condensation on the sides of the bottle.
I have seen it happen before,when I took it out of the humidity bin the aerial roots dried up.
If I had a couple of buds to play with like on that cutting there id be tempted to snip it off just above that long bud you have going and pot the rest up to see if it takes,then you have 2 for the price of one.You could just snap it off to stop it wasting energy.As I said,dumb figs