I saw this same error in another scenario in my experimenting app (testing a Bot). Never figured out the issue. I think I sent a support ticket in about it, but I also think it was abandoned.
Ahh, wait, just figured it out. I had manually edited the backend GSheet , and put a line break in a cell (with ctrl-enter). That must be the “000A” character mentioned. Removing that, I was able to test the bot without producing an error. @jesslm17 , are you using line breaks within cell values anywhere?