I just mixed some fresh XTOL. I was doing too many things at once and mixed pat "A" & "B" together with the water at the same time. The directions say part "A" must be completely dissolved before adding part "B".
I went ahead and developed two rolls of 120 and it seems fine??? One roll was Neopan 400 the other TMAX 400 They both seem to be fine. Good detail in the shadows so I guess I dodged the bullet??
It should make little if any differance, as long as you mixed well which you obviously did. Usually Part A of a developer is dissolved before the alkali Part B to help prevent oxidation of the developing agents, and also just to aid dissolution.