I'm 500% sure tesseras are hybrids. Anyone who doesn't want to breed hybrids can donate their tessaras to me for free (shipping at your costs).
In all seriousness though, from the dozens of threads I've read that have the same subject, I can only conclude that the people who started advertising them as tesseras had no bad intentions. If tesseras were hybrids, it was generations before we ever got to see them. Does it really matter if they are hybrids? I mean, all the snakes we have in our collection have probably been cross-bred at least once in their lineage, even the wild-caught ones. Personally, I'll hang on to my tessera girl whether she's hybrid or not - to me, she's perfect just the way she is
~Isoldael