Some threads never appear on InDesign forum's list of threads

I noticed a strange thing:

Sometimes I receive an email notification regarding a message in a thread I'm participating in. However, the thread itself doesn't appear on the InDesign forum anymore. That is, it doesn't appear here:

https://community.adobe.com/t5/indesign/ct-p/ct-indesign?page=1&sort=latest_replies&lang=all&tabid=all

For example, this post:

https://community.adobe.com/t5/indesign-discussions/changing-linked-color-photos-to-grayscale-or-duotone-in-new-ai-powered-indesign/m-p/15083973#M605309

It's nowhere on the list of forum's threads anymore. At least not among January 11 posts. Obviously, the thread was there at some point as I did post replies to this thread.

It doesn't happen too often. But I do notice this couple times a month maybe.

If this bug only affects threads I'm already participating in, then it's not a big deal as I do receive notifications. However, if some threads simply never appear on the forum for some users and therefore can never be seen, then it's naturally a bigger issue.