Hi,
We have some code that gets a tries to get all the fields names on a pdf and set them to false.
Most field names are returned correctly, however if the field name is C1_AMT01.2 , then anything from the dot onwards gets stripped out.
When field names have a dot, it indicates that there is a child field. So in this case, C1_AMT01 is the parent and 2 is the child. I am not sure whether this is intentional in your document or not but perhaps you could check/share the XFDF to see what is going on with the field.
From your document, I see the fields in both WebViewer and the XFDF. This is done through the FieldManager and I can see it in the list as well as through the children property on the parent field C1_AMT01.