AMP libraries are being requested without protocol, causing AMP pages to fail validation.
This would appear to have changed in the last few days so I don't think this is a fault within the AMP module itself, perhaps a recent change in a contributed module or core. Or maybe AMP validation?
AMP Validator error message:
The attribute 'src' in tag 'amp-form extension .js script' is set to the invalid value '//cdn.ampproject.org/v0/amp-form-0.1.js'.
Caused by site loading the libraries as follows:
<script src="//cdn.ampproject.org/v0.js" async></script>
Locally (via http) the scripts are loaded with the https protocol suffixed, this only occurs on dev/test/live servers (in my case on Pantheon).
Fixed
3.5
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This bit of code, or something similar, should be a candidate for this module:
https://www.drupal.org/project/advagg/issues/3196959#comment-15691865 🐛 Disable "Convert absolute paths to be protocol relative paths." on AMP pages to avoid validation error Needs review
By overriding the the advagg JsOptimize Asset, if advagg is present, a conditional can be added to check for ampproject URLs and return the path before the protocol is stripped off.