I tried the workaround from @PurplProto and it kind of worked. Her steps didn’t produce the desired result at startup. I had to run sudo mount -a to mount the system.
However, I’ve found another workaround.
The system worked after running these steps:
In fstab (note you have to explicitly mount C: first since we process fstab before automounting DrvFs):
In /etc/fstab
sudo nano /etc/fstab
Add the following lines
C: /mnt/c drvfs rw,noatime,uid=1000,gid=1000,umask=22,fmask=11 0 0
/mnt/c/home/username/your/windows/folder /home/username/your/ubuntu/folder none bind 0 0
Then shutdown WSL from the windows terminal
wsl --shutdown
Reference: Automount additonal filesystems from fstab · Issue #2636 · microsoft/WSL · GitHub