Screen sharer hears a mono-only microphone in the left channel only

(#892) Bug Needs triage video voice

Observed behaviour

When a user that using a condenser microphone with only Mono Channel Support will cause the user that was screen sharing to heard left sided audio of the user using the condenser microphone. It only happens to screen share user. Other people who either spectating or not screen sharing is not affected. This issue is tested in self-instance server, not tested in fluxer.app yet

Reproduction steps

  1. Two people, joining an audio channel with a person using mono only channel support microphone and a normal user
  2. The normal user start screen share with full screen as the selection
  3. While the person with mono channel support microphone speaks, the person who currently screensharing will heard left sided audio of the person speaking that using mono only channel support.

Build information

Stable Web 2026.930.165028, Windows NT 10.0 (x64), Microsoft Edge 154.0.0.0, Locale zh-CN

Platform

Web

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