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Describe the bug

I'm using an LG Ultrafine 27" 4K monitor and after updating to MacOS v11.6 yesterday, the volume and brightness keys stopped functioning. Even the volume slider in the menu is in disabled state for monitor speakers.

Here's how it shows:

Steps to reproduce

Update to MacOS 11.6 on an M1 machine with an external monitor

Expected behavior

For the volume and brightness control to work as normal like with MacOS v11.5 and before

Anything else?

No response

Environment Information (please complete the following information)

- macOS version: 11.6 Big Sur
- Mac model: Mac mini (M1, 2020)
- MonitorControl version: 3.0.0 build 2869 - Apple Silicon
- Monitor(s): LG Ultrafine 27" 4K
- Apple Silicon/M1 (yes or no): yes