Thanks for all the details that you have shared. The power management support in your PC is similar to my laptop. And the issue not related to power management.
With the details that you have provided, I am able to replicate the issue with Firefox browser where the audio pauses when the monitor goes off. But with Edge browser, the behaviour is similar to what you have explained. Audio skips for a second and then continues.
The issue looks browser specific since the audio is paused by Firefox. Reporting the bug on Firefox is the appropriate thing to do File a bug report or feature request for Mozilla products | Contributors Help
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