Page fetch: Failed: Crawl anomaly Indexing
looks like the underlying problem.
For some unknown reason (a hiccough in the line at your end or theirs), Google wasn't able to fetch this file.
The values in the other lines are consistent with this.
Google will eventually search it again, but you can request that it happen sooner (within a few ...
Do not add X-Robots-Tag "noindex" in the AJAX function. That may block the main html page.
We thought it would be a good idea, we did it in a project and what happened is that the AJAX portion of the page affected to the "mother" HTML page and Google considers that we are giving a "noindex" header to the mother page.
This is the result in our GSC. Of ...