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diff --git a/testcases/t/552-net-wm-state-multiple-changes.t b/testcases/t/552-net-wm-state-multiple-changes.t
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+++ b/testcases/t/552-net-wm-state-multiple-changes.t
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+#!perl
+# vim:ts=4:sw=4:expandtab
+#
+# Please read the following documents before working on tests:
+# • https://build.i3wm.org/docs/testsuite.html
+#   (or docs/testsuite)
+#
+# • https://build.i3wm.org/docs/lib-i3test.html
+#   (alternatively: perldoc ./testcases/lib/i3test.pm)
+#
+# • https://build.i3wm.org/docs/ipc.html
+#   (or docs/ipc)
+#
+# • https://i3wm.org/downloads/modern_perl_a4.pdf
+#   (unless you are already familiar with Perl)
+#
+# Test that i3 supports setting multiple _NET_WM_STATE changes in one ClientMessage.
+# Bug still in: 4.23-21-g6a530de2
+use i3test;
+
+my $_NET_WM_STATE_REMOVE = 0;
+my $_NET_WM_STATE_ADD = 1;
+my $_NET_WM_STATE_TOGGLE = 2;
+sub send_event {
+    my ($win, $add) = @_;
+    my $msg = pack "CCSLLLLLL",
+        X11::XCB::CLIENT_MESSAGE, # response_type
+        32, # format
+        0, # sequence
+        $win->id, # window
+        $x->atom(name => '_NET_WM_STATE')->id, # message type
+        ($add ? $_NET_WM_STATE_ADD : $_NET_WM_STATE_REMOVE), # data32[0]
+        $x->atom(name => '_NET_WM_STATE_FULLSCREEN')->id, # data32[1]
+        $x->atom(name => '_NET_WM_STATE_STICKY')->id, # data32[2]
+        0, # data32[3]
+        0; # data32[4]
+
+    $x->send_event(0, $x->get_root_window(), X11::XCB::EVENT_MASK_SUBSTRUCTURE_REDIRECT, $msg);
+    sync_with_i3;
+}
+
+my $ws1 = fresh_workspace;
+my $win = open_floating_window;
+
+# Nothing to remove
+send_event($win, 0);
+is_num_fullscreen($ws1, 0, 'no fullscreen window');
+
+# Enable
+send_event($win, 1);
+is_num_fullscreen($ws1, 1, 'one fullscreen window');
+my $ws2 = fresh_workspace;
+is_num_fullscreen($ws2, 1, 'sticky fullscreen window in second workspace');
+
+# Disable
+send_event($win, 0);
+is_num_fullscreen($ws1, 0, 'no fullscreen windows');
+is_num_fullscreen($ws2, 0, 'no fullscreen windows');
+cmd "workspace $ws1";
+is(@{get_ws($ws1)->{floating_nodes}}, 0, 'No floating (sticky) window in first workspace');
+is(@{get_ws($ws2)->{floating_nodes}}, 1, 'One floating (non-sticky) window in second workspace');
+
+done_testing;