[Python] Matplotlib saved animation has compression artifacts after ffmpeg update

I am using matplotlib.animation.FuncAnimation.save to produce .mp4 animation files. I have recently updated the ffmpeg package, but now it causes ugly compression artifacts to appear in the generated videos. I have solved my issue by rolling back to the old version of the ffmpeg package, but maybe someone can suggest a proper solution or advise me where to report this issue.

ffmpeg 6.1.1 produces videos with the artifacts. ffmpeg 4.2.2 produces videos without the artifacts.

I am using matplotlib 3.10.0, numpy 2.1.3, python 3.10.

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