Some tracked topics not showing up as unread

The issue was resolved for quite a while, but has resurfaced. It’s affecting one topic so far, that I know of, the JSON response from latest.json shows the following for the affected topic:

{
        "id": 65108,
        "title": "WaniKani has officially stopped clicking my POLLs",
        "fancy_title": "WaniKani has officially stopped clicking my POLLs",
        "slug": "wanikani-has-officially-stopped-clicking-my-polls",
        "posts_count": 1867,
        "reply_count": 1577,
        "highest_post_number": 1868,
        "image_url": "https://global.discourse-cdn.com/wanikanicommunity/optimized/4X/1/7/f/17f7e88c4ebd69e1b8ea76b74625f8f8a17447ae_2_1024x482.jpeg",
        "created_at": "2024-03-02T23:27:05.198Z",
        "last_posted_at": "2024-03-11T06:12:55.262Z",
        "bumped": true,
        "bumped_at": "2024-03-11T06:12:55.262Z",
        "archetype": "regular",
        "unseen": false,
        "last_read_post_number": 4271,
        "unread": 0,
        "new_posts": 0,
        "unread_posts": 0,
        "pinned": false,
        "unpinned": null,
        "visible": true,
        "closed": false,
        "archived": false,
        "notification_level": 2,
        "bookmarked": false,
        "liked": true,
        "tags_descriptions": {
          
        },
        "views": 547,
        "like_count": 4970,
        "has_summary": true,
        "last_poster_username": "shuly",
        "category_id": 9,
        "pinned_globally": false,
        "featured_link": null,
        "has_accepted_answer": false,
        "can_vote": false,
        "posters": [
          {
            "extras": null,
            "description": "Original Poster",
            "user_id": 78576,
            "primary_group_id": 174,
            "flair_group_id": 174
          },
          {
            "extras": null,
            "description": "Frequent Poster",
            "user_id": 151896,
            "primary_group_id": 118,
            "flair_group_id": 118
          },
          {
            "extras": null,
            "description": "Frequent Poster",
            "user_id": 13491,
            "primary_group_id": 214,
            "flair_group_id": 214
          },
          {
            "extras": null,
            "description": "Frequent Poster",
            "user_id": 69207,
            "primary_group_id": 171,
            "flair_group_id": 171
          },
          {
            "extras": "latest",
            "description": "Most Recent Poster",
            "user_id": 51836,
            "primary_group_id": 204,
            "flair_group_id": null
          }
        ]
      }

I gathered that the last time this happened, it was because the count would be off when a lot of replies to a post were deleted or moved, but since this is a relatively new topic I don’t think that’s the case here.

Incidentally, the issue seemed to resolve itself last time as I unignored the user I had ignored, and has now resurfaced very shortly after I ignored a user. It might be a coincidence, but I have a feeling ignoring users and post counts not matching up are connected somehow. Also interestingly, the user in question does not have any activity in the affected thread.