Oh, it seems like one of the new features in v6.12.0 ("Added logic to replace numbers in 'name' with regex pattern") is creating an issue for Google forms. That feature was added to try and solve the problem of input fields that have dynamically generated names containing random numbers (e.g.,
<input name="field_858651051351">). For such fields, a rule generated by the wizard would not work because the next time the user goes to that page, the field would have a different name (e.g.,
<input name="field_915865811911">). By replacing the series of numbers with the regular expression
\d{3,} (match any string containing at least three numbers), the aim was to make the wizard smarter, but I see now that it is also causing issues as in your case.
Okay, I will remove this feature and release the hotfix v6.12.2 shortly. Thanks for reporting!