BUG: Audio track 2 not playing audio

Audio track 2 on a timeline with a number of audio tracks, after the first couple clips laid down on that track, do not play back. So I opened Fairlight and see none of the many later clips edited into track 2 are shown on its timeline, visually or can be heard.

If I take move an audio clip from another audio track to track 2, it becomes silent, and doesn't appear in Fairlight even though it's there on the edit timeline. If I select all of track 2 clips in Fairlight, including clips that have disappeared, and move them to another audio track, the missing clips magically reappear, and can be heard.