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diff --git a/test/units/TEST-22-TMPFILES.08.sh b/test/units/TEST-22-TMPFILES.08.sh
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+++ b/test/units/TEST-22-TMPFILES.08.sh
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+#!/bin/bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# Verify tmpfiles can run in a root directory under a path prefix that contains
+# directories owned by unprivileged users, for example when a root file system
+# is mounted in a regular user's home directory.
+#
+# https://github.com/systemd/systemd/pull/11820
+set -eux
+set -o pipefail
+
+rm -fr /tmp/root /tmp/user
+mkdir -p /tmp/root /tmp/user/root
+chown daemon:daemon /tmp/user
+
+# Verify the command works as expected with no prefix or a root-owned prefix.
+echo 'd /tmp/root/test1' | systemd-tmpfiles --create -
+test -d /tmp/root/test1
+echo 'd /test2' | systemd-tmpfiles --root=/tmp/root --create -
+test -d /tmp/root/test2
+
+# Verify the command fails to write to a root-owned subdirectory under an
+# unprivileged user's directory when it's not part of the prefix, as expected
+# by the unsafe_transition function.
+echo 'd /tmp/user/root/test' | (! systemd-tmpfiles --create -)
+test ! -e /tmp/user/root/test
+echo 'd /user/root/test' | (! systemd-tmpfiles --root=/tmp --create -)
+test ! -e /tmp/user/root/test
+
+# Verify the above works when all user-owned directories are in the prefix.
+echo 'd /test' | systemd-tmpfiles --root=/tmp/user/root --create -
+test -d /tmp/user/root/test