OBS not capturing Brave audio after Sonoma 14.8.4 update

After updating to Sonoma 14.8.4, OBS is failing to capture the audio of my Brave browser.

• Audio was captured just fine prior to the update (previous version was Sonoma 14.8.1).
• When using macOS Screen Capture > Display Capture, the audio is captured (i.e. when the entire system audio is captured), but when using ...>Application Capture or ...>Window Capture, the audio is not captured (i.e. when the capture is specific to Brave)
• When using other browsers (e.g. Firefox), the audio is captured, so it is specifically an issue with the interaction between Brave, OBS and Sonoma 14.8.4.

I know this is kind of a niche issue but any pointers are greatly appreciated.