MSI laptop internal speakers worked for awhile after install, now get nothing; Bluetooth works

I performed a full wipe and clean install of Bazzite about a month ago on my MSI laptop, which came pre-installed with Windows 11. All went smoothly, and I had no issues.
About a week or so later, the laptop's internal speakers, which had been working fine, stopped playing any audio whatsoever in either Desktop or Gaming mode.
If I pair Bluetooth speakers or headsets to the laptop, I do get sound through those just fine.
I tried switching Playback Devices, but they all behave the same way, i.e. no sound.
I suppose it's possible there might be a sudden hardware fault with the internal speakers on this less than 1 year old laptop, but I suspect it's a software issue. I am fairly comfortable with using Linux at the command line level, but have no idea where to begin troubleshooting this issue.
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MSI laptop internal speakers worked for awhile after install, now get nothing; Bluetooth works - Universal Blue