I have the same vomiting policy as you. I've also had a child who did the same!!

She's been with me for 3 years and for the first 1-2 years, she would occasionally vomit at the lunch table. The first few times I sent her home but like yours, I realized it was likely a texture thing. I also noticed it would happen more often (but not always) after I said, "try one more bite". Now, when she says she's done, I believe her lol. I also don't send home anymore as I've learned it's not an illness and her staying causes no concerns. She did it at home too. It's been a long time since it's happened so hopefully she's outgrown it!