AMP Pages got 404'd and no longer indexed, but there it still up fine

[Black_Sin]

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

[Dimitri]

Check:
- your logs, to see if googlebot is effectively accessing your pages,
- if you have rules which might accidentally block googlebot,

[Black_Sin]

Googlebot, while not perfect, is effectively access all my pages
There are no rules that blocked googlebot

The pages itself is indexed in Google Search, but not the AMP pages if I search on Mobile
I tried to ask for validation in Search Console AMP category but it's been a month and the progress seems like got stuck, no more progress everyday

[tangor]

Asking the obvious question, can the amp pages be accessed by ordinary devices? Has that been tested? GSC has had a number of issues for some folks over the last year ... might this be a reporting error and not an access error?

That said, g is not that keen on amp any longer. Another of those "get everyone stirred up to Make A Big Change" kind of things that fizzles out over the long haul.

Me? Never saw the point of amp and never went there, so I can't be of help beyond asking the obvious question.

[Black_Sin]

Yes AMP pages can be directly accessed by either mobile phone or mobile-view on desktop browser simply just by adding /amp/ by the end of it.
Not all AMP pages got deindexed and they still show on Search Result, it just the other 2.000 AMP pages suddenly got 404 error
It's been almost a month so I am starting to doubt that this is simply GSC report error, but who know, the new GSC been janky since beginning

AMP is very good option here especially since majority of the user still have slow internet. And the ads is nice too.
So gonna keep it for now until Google decide it is not viable anymore