Hey Charly - thank you for reaching out. I'd suggest just running the formula to see if it works. Typically, the preview is sometimes a little buggy, but the underlying formula will work. Let me know if you run into any issues.
Would you mind sending me a URL to your table so I can take a look? My initial instinct is that we currently have a bug with Gemini and since you're using that model, it is probably related to that.
Petar - Sorry for this, it looks like we've got a bug on our hands. I've escalated this to our engineering team to help look into it. We'll follow up here as soon as we know more!