Multiple simultaneous PGS subtitles

Version

Media3 main branch

More version details

I checked in the app i was having this issue with and found this reference androidx-media3 = "1.6.1"

Devices that reproduce the issue

OnePlus 12
+
that one $20 walmart brand androidtv box that everyone buys
https://www.walmart.com/ip/onn-Google-TV-4K-Streaming-Box-New-2023-4K-UHD-Resolution/2835618394?wl13=2257&selectedSellerId=0&wmlspartner=wlpa&gStoreCode=2257&gQT=1

Devices that do not reproduce the issue

No response

Reproducible in the demo app?

YES

Reproduction steps

sort of a repost of an older issue from the now deprecated exoplayer repo
https://github.com/google/ExoPlayer/issues/7458
so I think it's the latest. the issue is still present. More or less makes Anime with PGSSUB unwatchable as there are frequently signs that have translations pasted over them with PGSSUB and also audio subtitles going at the same time.

Expected result

PGSSUB displays eg a sign translation and also an audio track translation at the same time

Actual result

one of the two will display for a quarter of a second then disappear.

Media

http://ex.mayogirl.com/exoplayer2.mkv
well, I would like to share the original file but copyright, so hopefully this is good enough I destroyed the video quality so it's unwatchable, but the audio and subtitles are still there.
14:00 and start, 14:04 a subtitle appears, and at 14:05 a character begins to speak, which has a corresponding subtitle, it should look like this (reference VLC):

instead the first subtitle disappears prematurely, and the subtitle associated with the audio track never appears to begin with. it stays like this until there is only 1 subtitle attempting to be presented, at which point subs resume normally.

if this isn't good enough I would appreciate a little help figuring out how to create a test video, extracting the PGSSUBs from this one and slapping it on an unrelated video would be fine but I dont even know how to do that.

Bug Report

• You will email the zip file produced by adb bugreport to android-media-github@google.com after filing this issue.