Hi,
Thanks for reaching out.
The Dynamic Search Campaign is currently not supported in Final Url Report and this is the reason why it only shows statistic for non-dynamic ads or to ads that do not belong to a Dynamic Search Campaign. The only reports that supports this kind of campaign are Criteria Performance report, Keywordless Category report, and Keywordless Query report. You may refer to this link to read more about the reports that have been mentioned to achieve the data that you want.
Please let me know if you have further questions/clarifications.
Regards,
Ejay
Google Ads API Team