disk-image-create fails with "mount: /dev/mapper is not a block device"

Issue

• disk-image-create fails at mount: /dev/mapper is not a block device:

2019-11-13 15:04:55.700 | + qemu-img convert -f qcow2 -O raw /home/bcharahr/rhel-server-7.6-x86_64-kvm.qcow2 /tmp/tmp.uXYbFbRVyF/pwYgka.raw
2019-11-13 15:04:55.700 | ++ sudo kpartx -l /tmp/tmp.uXYbFbRVyF/pwYgka.raw
2019-11-13 15:04:55.700 | ++ awk '/loop[0-9]+p/'
2019-11-13 15:04:55.700 | ++ wc -l
2019-11-13 15:04:55.700 | + ROOT_PARTITION=p0
2019-11-13 15:04:55.700 | + sudo udevadm settle
2019-11-13 15:04:55.700 | + sudo losetup -f
2019-11-13 15:04:55.700 | /dev/loop8
2019-11-13 15:04:55.700 | ++ sudo kpartx -av /tmp/tmp.uXYbFbRVyF/pwYgka.raw
2019-11-13 15:04:55.700 | ++ awk '/loop[0-9]+p0/ {print $3}'
2019-11-13 15:04:55.700 | + ROOT_LOOPDEV=
2019-11-13 15:04:55.700 | + '[' -f /.dockerenv ']'
2019-11-13 15:04:55.700 | + timeout 5 sh -c 'while ! [ -e /dev/mapper/ ]; do sleep 1; done'
2019-11-13 15:04:55.700 | + EACTION='sudo kpartx -d /tmp/tmp.uXYbFbRVyF/pwYgka.raw ; rm -r /tmp/tmp.uXYbFbRVyF'
2019-11-13 15:04:55.700 | + trap 'sudo kpartx -d /tmp/tmp.uXYbFbRVyF/pwYgka.raw ; rm -r /tmp/tmp.uXYbFbRVyF' EXIT
2019-11-13 15:04:55.700 | + mkdir /tmp/tmp.uXYbFbRVyF/mnt
2019-11-13 15:04:55.700 | ++ sudo blkid -o value -s TYPE /dev/mapper/
2019-11-13 15:04:55.701 | + '[' xfs = '' ']'
2019-11-13 15:04:55.701 | + MOUNTOPTS=
2019-11-13 15:04:55.701 | + sudo mount /dev/mapper/ /tmp/tmp.uXYbFbRVyF/mnt
2019-11-13 15:04:55.701 | mount:  /dev/mapper is not a block device
2019-11-13 15:04:55.701 | ++ sudo kpartx -d /tmp/tmp.uXYbFbRVyF/pwYgka.raw
2019-11-13 15:04:55.701 | ++ rm -r /tmp/tmp.uXYbFbRVyF