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Changes between Initial Version and Version 1 of Ticket #40931, comment 3

initial	v1
1	1	I am also seeing this problem (I am the person who reported in the post linked by @tobifjellner).
2	2
3		It is happening with GET calls to page and post URL's ending with /embed/, on some but not all pages on a few of my sites - most don't have the problem. All sites have different themes. The error persists when disabling various plugins and also persisted when I switched one site to TwentyFifteen for testing. So no obvious conflict ~~causing it~~.
	3	It is happening with GET calls to page and post URL's ending with /embed/, on some but not all pages on a few of my sites - most don't have the problem. All sites have different themes. The error persists when disabling various plugins and also persisted when I switched one site to TwentyFifteen for testing. So no obvious conflict that I can find as the cause.
4	4
5	5	It does happen consistently on GET requests to specific pages-- that is, once I can isolate a page where it is occuring, I can trigger the error simply by browsing to (example): https:// mysite.tld/permalink/embed/ and the error will recur each time I reload the page.