MPRIS position and length properties does not reset between media changes

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:141.0) Gecko/20100101 Firefox/141.0

Steps to reproduce:

1. Go to any site that plays audio (For me i tested NicoNico Douga and YouTube)
2. Start playing audio, and wait for metadata to come over MPRIS
3. Switch the video playing
4. Wait for the new metadata

P.S. This issue is only present after i upgraded firefox from the arch official repositories, the version i vaguely remeber to be around 136- 141 that this bug appeared, it does not appear roughly before bug 1950461 got resolved

Actual results:

YouTube metadata switched to the new video, but position and length properties did not reset (unexpected)
NicNico Douga metadata switched to the new video after a short period of disappearing, which fully resetted the metadata (expected)

Expected results:

Both YouTube and NicoNico Douga should have their positions and lengths reset when the media changes

Also i would like to add something i forgot to mention:

from my observation, NicoNico seems to deregister itself as an audio playing tab before registering again with the new video, which seems to fully reset the metadata, youtube meanwhile does not do this

The severity field is not set for this bug.
:jimm, could you have a look please?

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Hello, could you help me capture a media profile by following this instruction? Thanks!

(In reply to Alastor Wu [:alwu] from comment #3)

Hello, could you help me capture a media profile by following this instruction? Thanks!

(Update, im now on Version 144, still on stable, the bugs are not addressed as far as i can tell, here are the snapshots, sorry for late reply)

Here is a snapshot for when i just refreshed a page, the bug did not appear here
https://share.firefox.dev/4nx8ah8

Here is another one for when i changed page, the bug is occuring here
https://share.firefox.dev/4hVmtep

(Both profiles i took from stable, currently compiling nightly as i post this, will reply again when i sort that out, again very sorry for the late reply)

(In reply to Echo_vcf from comment #4)

(In reply to Alastor Wu [:alwu] from comment #3)

Hello, could you help me capture a media profile by following this instruction? Thanks!

(Update, im now on Version 144, still on stable, the bugs are not addressed as far as i can tell, here are the snapshots, sorry for late reply)

Here is a snapshot for when i just refreshed a page, the bug did not appear here
https://share.firefox.dev/4nx8ah8

Here is another one for when i changed page, the bug is occuring here
https://share.firefox.dev/4hVmtep

(Both profiles i took from stable, currently compiling nightly as i post this, will reply again when i sort that out, again very sorry for the late reply)

Typo: my second profile actually wasnt from changing pages, changing page works as expected too, it was changing video on youtube by clicking one in the side bar, sorry about that

(In reply to Echo_vcf from comment #4)

(In reply to Alastor Wu [:alwu] from comment #3)

Hello, could you help me capture a media profile by following this instruction? Thanks!

(Update, im now on Version 144, still on stable, the bugs are not addressed as far as i can tell, here are the snapshots, sorry for late reply)

Here is a snapshot for when i just refreshed a page, the bug did not appear here
https://share.firefox.dev/4nx8ah8

Here is another one for when i changed page, the bug is occuring here
https://share.firefox.dev/4hVmtep

(Both profiles i took from stable, currently compiling nightly as i post this, will reply again when i sort that out, again very sorry for the late reply)

Heres the profiles from nightly, the bug is still present

First Initialization (working fine)
https://share.firefox.dev/48V1q9a

Changing video (does not work fine)
https://share.firefox.dev/4oOHVDW