Track matte stinger hangs on last frame after opening settings

Operating System Info

Windows 11

Other OS

No response

OBS Studio Version

30.2.3

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/JIyjgL33a10h2cfd

OBS Studio Crash Log URL

No response

Expected Behavior

Stinger to play back the same after opening it's settings as when OBS is first launched.

Current Behavior

Track matte stinger holds it's last frame for too long only after opening and saving the properties for the stinger.
See this behaviour in the OBS recording in this Google Drive folder, also included in there is the test stinger I used to demo this. https://drive.google.com/drive/folders/12c_JG5_kub_FAK-TxY4ZSHsSECFIYsyU

Note that in the recording I open the select file dialog as that's how I originally noticed this. Since taking the recording, I've noticed this happens without actually touching any settings; just opening the stinger properties and then closing with the "OK" button is enough to trigger this.

The provided log file is not for the recording shown, it's of a simpler reproduction where I just open the properties and click "OK" without opening the file browser.

Steps to Reproduce

1. Create two scenes with obvious differences.
2. Load the stinger provided in the above Google Drive link. Enable track matte stacked. I also have pre-load to RAM checked.
3. Run the stinger transition and observe it running correctly.
4. Open the stinger properties, click "OK"
5. Run the transition again, notice now the last frame is held for too long.

You can mitigate this now it's in this state by restarting OBS and the problem goes away until you open the properties again and click "OK". Note that "Cancel" does not seem to trigger this behaviour.

Anything else we should know?

No response

Reproduce the issue in OBS Studio 30.2.3 on Windows 11 using the provided test stinger and OBS log, comparing playback before and after opening and saving the stinger properties. Check whether opening the properties with OK changes track-matte playback state; done means the transition no longer holds its last frame after saving, while Cancel and restarting OBS remain consistent.