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Regression: v1.21.0 - 'New Messages' threshold missing #1892

Description

@Turbosquid226

Describe the bug

The 'New messages' green line that previously separated read and new messages no longer shows with Sable v1.21.0. Opening a room with many new events immediately marks all as read, with no indicator as to where you left off. This is separate from the 'jump to unread' button which seems to have been non-functional since at least April (#635).

The new message threshold functioned properly in v1.20.0 with the same browser/homeserver at least the majority of the time.

Reproduction

  1. Open Sable v1.21.0
  2. Find a room with many unread events
  3. Open the room, scroll up to find where you left off
  4. No 'new messages' line indicates where old messages end and new begin

Expected behavior

The green 'New Messages' line/indicator appears after the last read message, before unread messages, and remains there until you can find it

Platform and versions

OS: Linux Ubuntu 26.04
Browser: Chrome 150
Sable version: 1.21.0
Matrix homeserver: Private self-hosted running synapse 1.157.2

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