I'm not sure about cans but I doubt it as I stated before, nitrogen basically can't dissolve into water. I know guinness is typically forced through restrictor plate which uses beer gas (25% Nitrogen 75% CO2) for the extra pressure needed.
That massive head is all the nitrogen leaving solution
Nitrogen dissolves poorly, but enough of it remains to cause the different density that allows a black and tan to float, or this abomination. You say you homebrew, but aren't even willing to look up this information and argue with internet strangers about it.