diff --git a/test/units/testsuite-29.sh b/test/units/testsuite-29.sh
index e99e1d2cba..3b1395619a 100755
--- a/test/units/testsuite-29.sh
+++ b/test/units/testsuite-29.sh
@@ -152,6 +152,14 @@ portablectl inspect --cat --extension app0 --extension app1 rootdir app0 app1 |
 
 portablectl detach --now --runtime --extension /tmp/app0 --extension /tmp/app1 /tmp/rootdir app0 app1
 
+# Attempt to disable the app unit during detaching. Requires --copy=symlink to reproduce.
+# Provides coverage for https://github.com/systemd/systemd/issues/23481
+portablectl "${ARGS[@]}" attach --copy=symlink --now --runtime /tmp/rootdir minimal-app0
+portablectl detach --now --runtime --enable /tmp/rootdir minimal-app0
+# attach and detach again to check if all drop-in configs are removed even if the main unit files are removed
+portablectl "${ARGS[@]}" attach --copy=symlink --now --runtime /tmp/rootdir minimal-app0
+portablectl detach --now --runtime --enable /tmp/rootdir minimal-app0
+
 umount /tmp/rootdir
 umount /tmp/app0
 umount /tmp/app1