According to Kolari Vision, the thickness of the Z7 sensor stack would be 1.1mm. Too thick for M lenses wider than 35mm i suspect but i may be wrong.
https://kolarivision.com/nikon-z7-dissasembly-teardown/
Interesting thank you. I don't see wider M lenses than 35mm above. Are wider ones expected to produce color shift and/or smeared corners/edges on the mirrorless Nikons? I wonder how thick the sensor stack of those cameras can be.