Thanks for posting about this issue. This is a know quirk with the native form component and the team is currently trying to find a solution for this.
Basically the issue happens when elements are nested inside the Form Block, but outside of the Form. I made a quick video for you to show you the quick fix: https://cl.ly/2N1A1U2F2n2c
Hope this helps and I’ll be sure to post back here when the team has a solution in place.