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Since this needs a new post in a forum, this repro requires 2 accounts.

1. Create 2 categories with a forum channel in one and a text channel in another.
2. On account 1, untick "Show new posts as unread" in above forum channel's context menu.
3. On account 1, collapse the category that the forum channel is in.
4. On account 2, create a new post in the above forum channel.
5. On account 1, see the issue: pasted-image-1.png

I expected the forum channel to remain invisible, when new posts are created in it. Please note that

The forum channel shows up once there's a new post in it. Please note that the forum channel also remains visible, when I already read the new thread but just didn't open the forum channel directly yet (same as in https://feedback.fluxer.com/p/3988/forum-channel-keeps-its-unread-indicator-when-the-new-thread). Mobile app appears to respect the "Show new posts as unread" setting correctly (it doesn't have the UI for the setting but it still respects it and shows/hides the forum channel within a few seconds of when I enable/disable the setting on desktop).

Canary Desktop 2026.1017.133944, Web 2026.1017.133944, Linux 5.15.0-198-generic (x64), Electron 44.4.1, Chrome 152.0.7977.78, Node 24.21.0, Locale en-US