BlackmagicMediaSource causes a memory leak if "Just-In-Time Rendering" option is ON.

Since 5.3, BlackmagicMediaSource causes a memory leak. This didn't happen on 5.2.
You can see the leak on PIE.

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If "Just-In-Time Rendering" option in the MediaBundle is turned off, this memory leak seems to stop.

I checked this leak with MemPro and it shows the following callstuck causes the memory leak. 

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1. Download the attached project
2. Open it with UE5.3 or ue5-main.
3. You need to set Blackmagic capture card to output a video.
4. check that the MediaBundle in the scene correctly track the video from BlackMagicCaptureCard.
5. display Stat PlatformMemory and run PIE.
6. You can see that  Used Phsyicla/Virtual graduaaly increase.
7. Turn off "Just-In-Time Rendering" option in the MediaBundle.
8. You can see that the memory leak stops.