Thanks for providing the SOAP XML logs; they were extremely helpful in determining what was going on.
This means that you're going to see extra attributes that AdWords has generated when the feed has an
origin of
ADWORDS. For
Placeholder Type 7, you saw that you only had IDs 1-8 defined, which matches with the numbers in your
AttributeFieldMappings. The reason you did not see 9 or 10 in your
AttributeFieldMappings is because these mapping are used by AdWords and are not set through the API. For example, the mysterious
10 with its associated value that you did not find documented allows AdWords to sync the feed with the GMB account.