It might not be that the process was discovered so much as the method of cooking pot production happened to suit the food being cooked.
In particular, lots of civilizations learned to strengthen the basic clay pot by the addition of lime-y things, eg burnt mussel shells. If all your pots are made in this manner then you dont so much discover nixtamalization as experience it only by its absence when you meet settlers that have pellagra and dont use your style of pot.
See [0] for a technical write up on this and many other pot themes.
In particular, lots of civilizations learned to strengthen the basic clay pot by the addition of lime-y things, eg burnt mussel shells. If all your pots are made in this manner then you dont so much discover nixtamalization as experience it only by its absence when you meet settlers that have pellagra and dont use your style of pot.
See [0] for a technical write up on this and many other pot themes.
[0] https://onlinelibrary.wiley.com/doi/10.1111/arcm.12986