I am getting this warning from APM:
Search Console has identified that your site is affected by 1 AMP issues:
Warnings are suggestions for improvement. Some warnings can enhance your appearance on Search; some might become errors in the future. The following warnings were found on your site:
The header ‘link’ for the signed exchange payload has an invalid value.
We recommend that you fix these issues when possible to enable the best experience and coverage in Google Search.