https://gitlab.synchro.net/main/sbbs/-/issues/229#note_1659
TL;DR: We don't have per-message-per-user read/unread status in Synchronet.
webv4 considers a message "new" if its number is greater than your scan pointer for that sub. If you have ten unread messages in a sub, then read the newest one, your scan pointer now points to the newest message. Everything older (including the nine previously "unread" messages) is considered "read".
I didn't want to twiddle scan pointers from the web because of this, but people insisted, so now we have this shitty feature. I can maybe make it turn-offable.
I am considering different ways of dealing with this in the new forum XJS page, including a "new message scan" view, but we'll see how that works out.
001-forum.ssjs will be phased out soon either way.
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