Not at home after login

I have installed Ubuntu 22.04 in WSL2. I expect that the bash shall be started in the home directory that I find in /etc/passwd as

harper:x.1000:1000:,,,,:/home/harper:/bin/bash

But after starting wsl -d Ubuntu-22.04 the bash is somewhere in the Windows tree: /mnt/c/WINDOWS/system32. I only need to issue the cd command to get into home. And I could add this in a last line of ~/.bashrc. I already checked that this file is executed while starting bash.

But why do I see this strange behavior that the home directory is not the current directory?

Edit: I have also found a workaround. I can start wsl -d Ubuntu-22.04 --cd ~. But this doesn't explain, why it's necessary.