If, when, playing back an HLS stream with in-manifest captions, a cue's properties are modified, when seeking back and replaying the video so that the cue becomes active again, the cue becomes duplicated. Modifying any property of the cue will cause a new cue to be re-added with the original values and both of them to be displayed. I have a live example here https://simple-video.netlify.app/double-cues.html It waits for some cues to be available, modifies their `line` properties to be `0` and then seeks back. On the second play, there are now cues at the top and the bottom of the display area. To me, this seems a bit unexpected that a new cue is created even though the original reference still exists, even if it was modified. I'd expect no new cues to be created.
<rdar://problem/93624739>