joined:Feb 1, 2018
Since July 13th/14th, GSC showing a lot of AMP got 404 and "Linked AMP version is not indexed". There is no error from technical stand point, AMP pages are still up and can be visited. Every test showed they are valid. Tried to as re-crawl. Nothing happened. Tried to ask for validation, it work once, some pages got indexed again but couple days later the error increased and got de-indexed again.
Anyone know why? Is this related to Google Update because there were some uptick in SEMRush sensor on July 13th