As already mentioned, the 142 axle is nothing in itself to do with disc rotor mounting face dimensions.
But there is huge variation in hub manufacturers on disc mount face relative to dropout adaptor face, in frame manufacturers position of the post mount holes and also disc caliper manufacturers have their variations on where they put the mounting holes relative to the theoretical disc position. That’s three lots of completely independent sources which all stack up.
Some frame/hubs/calipers are fine, others are out of fit. For ref. the hope disc spacers are good and available in a range of thicknesses.