Using dist_build_unsafe_io=true causes this error.
Chrooting into /var/cache/pbuilder/base.cow_amd64/
env: unrecognized option '--force-unsafe-io'
Try 'env --help' for more information.
E: Sub-process env returned an error code (125)
E: setup failed: E: apt-get -o Dir::Bin::dpkg=env -o DPkg::Options::=--unset=TMPDIR -o DPkg::Options::=dpkg -o DPkg::Chroot-Directory=/var/cache/pbuilder/base.cow_amd64 --yes install -oDebug::pkgProblemResolver=true -oDebug::pkgDepCache::Marker=1 -oDebug::pkgDepCache::AutoInstall=1 -oAPT::Status-Fd=<$fd> -oDpkg::Use-Pty=false apt sudo devscripts debhelper strip-nondeterminism fakeroot apt-transport-tor eatmydata aptitude cowdancer fasttrack-archive-keyring ?narrow(?or(?archive(^bookworm$),?codename(^bookworm$)),?architecture(amd64),?and(?priority(required),?not(?essential))) failed at /usr/bin/mmdebstrap line 192.