<p>This question may require migration to Meta.SE, as it could be a site-wide "bug", but I thought that I would test the waters here, to see if there is an obvious explanation.</p>

<p>I noticed that a question of mine had been modified, on April 16, by "Song Khmer" <strike>in the <a href="https://3dprinting.stackexchange.com/unanswered">unanswered questions list</a>, when sorted by votes</strike><sup>1</sup>:</p>

<blockquote>
  <p><a href="https://i.stack.imgur.com/nY7mi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nY7mi.png" alt="Modification listed"></a></p>
</blockquote>

<p>However, when checking the <a href="https://3dprinting.stackexchange.com/posts/3015/revisions">revision history</a>, the April 16 edit, by <em>Song Khmer</em>, is not shown. The last modification was the "https everywhere" edit, three days prior:</p>

<blockquote>
  <p><a href="https://i.stack.imgur.com/p5B9M.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/p5B9M.png" alt="No apparent modification"></a></p>
</blockquote>

<p>I've not noticed the behaviour before. What is going on? Is it a bug, or something really obvious that I can't see? </p>

<p>Was it a rejected edit? If the latter, then should it really be shown in the Unanswered question list? Shouldn't the modifications listed in the Unanswered questions list, actually only be accepted modifications/edits?</p>

<hr>

<p><sup>1</sup> The unanswered list, and the sorting, are irrelevant to the actual issue.</p>

[{'answer_id': 223, 'author': 'tbm0115', 'author_id': 98, 'author_profile': 'https://3dprinting.meta.stackexchange.com/users/98', 'pm_score': 0, 'selected': False, 'text': "<p>The Stack Exchange network is undergoing a transition to HTTPS for its sites, including 3D Printing SE.</p>\n\n<p>This edit (from Community, it looks like), was probably scripted from SE Staff in attempt to fix content on Questions and Answers. Ultimately, I don't think this is worth migrating the SE Meta.</p>\n"}, {'answer_id': 227, 'author': 'tbm0115', 'author_id': 98, 'author_profile': 'https://3dprinting.meta.stackexchange.com/users/98', 'pm_score': 3, 'selected': True, 'text': '<p>Regarding the "invisible modification", there is technically a modification made multiple times by the user <strong>Song Khmer</strong> (now destroyed). This user was posting nonsense to your question by copying text from your question and posting it as an answer.</p>\n\n<p>The reason you probably did not see this in the revision history is:</p>\n\n<p>1) it wasn\'t a direct edit to your question</p>\n\n<p>2) I believe only moderators can see deleted posts.</p>\n\n<p><a href="https://i.stack.imgur.com/2VAiLs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2VAiLs.png" alt="enter image description here"></a> <a href="https://i.stack.imgur.com/2VAiL.png" rel="nofollow noreferrer">click here for full view</a> of deleted posts</p>\n\n<p>I\'m pretty sure that anytime someone posts an answer or edits your question, the post raises the modified flag. In this case, when the user was posting answers it would properly flag the post. But, the flag remained even after the answers were deleted (there were 3 answers).</p>\n'}]
['https://3dprinting.meta.stackexchange.com/questions/222', 'https://3dprinting.meta.stackexchange.com', 'https://3dprinting.meta.stackexchange.com/users/4762/']