Please make sure that sparseVhd is set to true in the "[experimental]" section in your .wslconfig file. If the VHD is not newly created, you can set your existing distros to be sparse by running
wsl --manage <distro> --set-sparse <true/false>
https://devblogs.microsoft.com/commandline/windows-subsystem-for-linux-september-2023-update/
Best Regards,
Ian Xue
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