It looks like this issue has happened before:
I thought maybe this was a propagation issue as I was trying to use a new option that I had just added to my Baserow select. But I let it sit for a few days and also tried testing it on some other options that are not new. When test the step (updating a row in Baserow) I consistently get an error:
“The app returned "The provided select option value '2214965' is not a valid select option.".” -- but I’m choosing an option from the list and it definitely exists in Baserow.