you have permission to try it yourself mark E. You are correct,gas pumps auto-electrochemicaly down each electrode to respective depths spontaneously during open circuit off mode however respective concentrations of gas are still different.it was the smart poster lanca IV who mentioned this earlier in this thread.

im going to have to hunt for one mark E. But dont you think that the o2 potential on the anode is diluted by the larger surface area of submerged electrode surface and the potential more concentrated on the cathode with less area for charge distribution?

so what you are in fact implying @mark E is that if we were to measure the potential of a grossly submerged oxygen electrode and a slightly submerged oxygen electrode that they would both measure exactly equal voltages against a standard reference electrode,correct?

which implies by default that you,re saying that regardless of submergence of an oxygen electrode in a swamp of electrolyte that its potential will always be the same @mark E..correct?

I tell you what:  Once you come up with a reference such as I asked for, then I will review that reference and we can discuss the matter further.

i tell you what @mark E, lets go with your flow,lets block communion between the gas of the 2 half-cells to make it easier for you and take it from there shall we? That removes your doubts regarding communion yes?

Never. Going. To. Happen.
QED.