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Bug#948209: singularity-container: unable to build Singularity container on WSL2

Package: singularity-container
Version: 3.5.2+ds1-1
Severity: important

I have a Singularity recipe file that has been working for months when
Debian GNU/Linux is installed directly on bare metal.  Today, I tried
to use it on Windows Subsystem for Linux 2 (from Windows 10 Pro for
Workstations Insider Preview, Build 19536), where it unexpectedly
fails.  It is unknown to me whether the problem is or is not due to a
limitation of WSL2.

Setup required in order to be able to reproduce:

Install Windows Subsystem for Linux 2 on a Windows system that
supports it.  Install the Debian GNU/Linux app from the Microsoft
store.  Invoke "debian", edit /etc/apt/sources.list to migrate from
buster to bullseye, perform the update/upgrade/dist-upgrade, install
singularity-container (which unfortunately is not in buster-backports
as I write this).

Then, create a simple recipe named foobar.recipe, containing:

Bootstrap: scratch
    debootstrap --arch=amd64 --include=build-essential,ca-certificates,dialog,diffuse,keyboard-configuration,less,nano,sudo,wget --variant=minbase --verbose buster $SINGULARITY_ROOTFS http://ftp.us.debian.org/debian/

Once the above is done, here is the reproduction procedure:
1. Launch an Adminstrator Powershell
2. Invoke "debian".
3. Invoke "sudo singularity build output.simg foobar.recipe"

Output observed:
INFO:    Starting build...
FATAL:   container creation failed: failed to mount directory filesystem /tmp/rootfs-ecb3e633-2faf-11ea-ab65-f8b46abb25dc: no such file or directory
FATAL:   while performing build: while running engine: while running /usr/lib/x86_64-linux-gnu/singularity/bin/starter: exit status 255

Expected output:
I expect Singularity to build a close-to-minimal Debian Buster image.

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.4.0-19536-Microsoft
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: unable to detect

Versions of packages singularity-container depends on:
ii  ca-certificates              20190110
ii  containernetworking-plugins  0.8.3-2
ii  libc6                        2.29-7
ii  libseccomp2                  2.4.2-2
ii  squashfs-tools               1:4.4-1

Versions of packages singularity-container recommends:
ii  e2fsprogs  1.45.4-1

singularity-container suggests no packages.

-- no debconf information

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