None of the both changeValue() versions described above seem to work anymore.
We tried both. Setting one field programmatically only keeps the changed value until the next field value is set. Setting multiple fields programmatically does not works. So the result remains unpredictable.
So - are there any other ways to transform or calculate field input and send these values?
So the Squarespace Formblock is useless in many cases or requires 3rd Party tools.