Anamorphic video embeds at the wrong size (e.g. 640x640 instead of 640x360)

Summary

hi all. i uploaded an anamorphic AV1 video to the 'Fluxer Developers' server just now, whose storage size is 360x360 (1:1), and display size is 640x360 (16:9). a seemingly 640x640 embed appeared, then upon playback, it did play back at the correct size but the embed was just too tall. screenshot of the player at 640x640 with a 640x360 video at the top, and a bunch of black space below i'll attach said video for testing, it is markiplier crunched down to 8mb. 573823323-fa87b74e-6a6e-492b-99b6-cad5b1c5313a.mp4

Steps to reproduce

1. upload an anamorphic embeddable video to fluxer.
2. click play on it.
3. observe the video displaying at the correct size, with an improperly sized embed.