J.D.
Mine started with the yoga and teeth at 11 months . I wanted to be done by one year so I started skipping the noon feeding and eventually the bedtime and finally the morning one. I had oversupply at first and found that my supply went down FAST just eliminating the afternoon feeding. I think that in general he was just already eating less at 11 months than he did as a newborn. So, when I took out the feeding, it was even less demand on the breast and it just made less milk.
If you had undersupply in the past, you could very well have undersupply or faster weaning if you skip a whole day. Maybe just skip a feeding if you want to keep going? My little sister had undersupply but exclusively bf for 6 months and is still feeding her almost 3 year old. She cut down to before nap and before bedtime. She didn't lose her supply.