The only times I've felt nauseous while/after eating is when I've gone too long without food. I think that's more from low blood sugar than the medication itself.
For example, last Friday I had an early appointment a couple hours away and skipped breakfast (which I almost never do), thinking I'd grab lunch early. The day got crazy, and I skipped lunch too. With these GLP-1s, I don't really feel hunger, so it was easy to keep going without thinking about it.
When I finally got home and made tuna, I felt nauseous after a few bites. Didn't throw up, but got sweaty and had to take deep breaths until it passed. I was fine the rest of the night and the next day, so it wasn't an illness, but it's happened before when I've gone too long between meals.
Just my two cents. If it keeps happening, try taking some meclizine an hour or so before eating to see if that helps.