Weird partition showing up in Big Sur

Weird partition showing up in Big Sur

Hello guys!

I just did a clean install of macOS Big Sur, and some weird partition is showing up in Disk Utility, do you guys know what this is?

https://preview.redd.it/79w5o0i8iuf61.png?width=3032&format=png&auto=webp&s=6cd836cd05f4090131d0f041778dabfdf0784902

submitted by /u/ineffablecharles
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