Cast audio only to Google Home speaker turns off video on PC

Situation:
I want to cast my movie audio from my PC to a Google Home speaker and continue watching the video portion on my Windows/Chrome player. (I am using a Google Home as my PC speakers - odd, I know, but ces’t la vie.
I know that this is possible because I do it all the time with YouTube and other sites.

Issue:
When I cast from the player it stops video playback and sends audio to the speaker.
When I cast from the browser tab it does the same thing (seems that the player functionality takes priority since the cast icon lights up orange).

Is this a bug?
Does Plex simply not recognize the endpoint as an audio-only endpoint?
Or is there something I can do to make this work?

Server Version#: 1.18.3.2156
Player Version#: 4.18.1 (assuming same? can’t find version number)

Plex does not support sending only audio like this.

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