Is the Original Sound setting broken in the Linux client?

I've been trying to get Zoom's original sound feature working in Linux (Mint 21.3). I'm pretty sure I have all of the settings correctly set, and when I use the "Test Mic" recording feature, music comes through perfectly. But then in an actual meeting it filters out everything that isn't speech. I've double and triple checked that original sound is on in the top bar, and I've tried every possible option to try to get it to work, both with an external and internal laptop mic.

Has anyone been able to get this working correctly in Linux, or is the feature just broken? Are there any system settings that need to be adjusted to get it working?