Environment

Windows build number: Microsoft Windows [Version 10.0.21337.1010]
Your Distribution version: Release:        10
Whether the issue is on WSL 2 and/or WSL 1: Linux version 5.4.91-microsoft-standard-WSL2 (oe-user@oe-host) (gcc version 9.3.0 (GCC)) #1 SMP Mon Jan 25 18:39:31 UTC 2021

Steps to reproduce

• give wsl a disk wsl --mount \\.\PHYSICALDRIVE1 --bare
• format it in btrfs sudo mkfs.btrfs /dev/sdc
• mount the filesystem sudo mount -o ssd,noatime,space_cache,commit=120,compress /dev/sdc /mnt/test
• optional, be incredibly liberal with permissions chown $USERNAME:$USERNAME /mnt/test; chmod ugo+rwx /mnt/test
• attempt to open \\wsl$\Debian\mnt\test in explorer

WSL logs: wsl.etl.log

Expected behavior

Windows has access to the btrfs drive.

Actual behavior

"is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.

Attempt to access invalid address."

The exact same issue was reported on the original blogpost about --mount but the fix is sshfs-specific