I think I've figured this out, if you go into Source/Content/XML/Preferences.xml in the extracted folder the values for musicVolume and sfxVolume should both be set to 0.25 but it seems like the leading zeroes are dropping off for some people. If you just update this to 0.25 again (or might be best to use 0 or 1 to avoid it being changed again) it should work for you.
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Did not work unfortunately, they were already set appropriately for me and changing them to a whole number didn't effect anything. I appreciate you going through the trouble to look for a solution though! I did some searching around myself and it seems like it might be a Monogame issue, I was able to find a forum post of someone else having my exact problem: https://community.monogame.net/t/game-with-monogame-3-8-1-not-working/18490
They were the dev for the game they were having issues with and solved it by publishing the game in a different format, though. I tried reinstalling .net 6 based on what was said in that thread, but no luck there
I actually looked at that thread for a different issue before, it's what prompted me to put the try/catch in that writes to log.txt. If you're not getting that much I think it means something's going wrong before it even gets to the game code :(
Not sure how invested you are but I've open-sourced the codebase if you want to try building it locally - https://github.com/wayne-dillon/NewGame