diff --git a/bin/tests/system/catz/ns2/named1.conf.in b/bin/tests/system/catz/ns2/named1.conf.in
index 5a7babdbfe..b1677e4dc1 100644
--- a/bin/tests/system/catz/ns2/named1.conf.in
+++ b/bin/tests/system/catz/ns2/named1.conf.in
@@ -68,7 +68,7 @@ view "default" {
 	};
 
 	# A faulty dlz configuration to check if named and catz survive a certain class
-	# of failed configuration attempts (see GL#3060).
+	# of failed configuration attempts (see GL #3060).
 	# We use "dlz" because the dlz processing code is located in an ideal place in
 	# the view configuration function for the test to cover the view reverting code.
 #T3	dlz "bad-dlz" {
@@ -116,6 +116,15 @@ view "default" {
 		primaries { 10.53.0.1; };
 	};
 
+	# When the following zone configuration is enabled, "dom3.example" should
+	# already exist as a member of "catalog1.example", and named should be able
+	# to deal with that situation (see GL #3911). Make sure that this duplicate
+	# zone comes after the the "catalog1.example" zone in the configuration file.
+#T4	zone "dom3.example" {
+#T4	    type secondary;
+#T4	    file "dom2.example.db";
+#T4	};
+
 	# No "version" property
 	zone "catalog-bad1.example" {
 		type secondary;
diff --git a/bin/tests/system/catz/tests.sh b/bin/tests/system/catz/tests.sh
index 4919dd5261..eacb39c078 100644
--- a/bin/tests/system/catz/tests.sh
+++ b/bin/tests/system/catz/tests.sh
@@ -656,6 +656,7 @@ status=$((status+ret))
 
 nextpart ns2/named.run >/dev/null
 
+# GL #3060
 n=$((n+1))
 echo_i "reconfiguring secondary - checking if catz survives a certain class of failed reconfiguration attempts ($n)"
 ret=0
@@ -682,6 +683,36 @@ status=$((status+ret))
 
 nextpart ns2/named.run >/dev/null
 
+# GL #3911
+n=$((n+1))
+echo_i "reconfiguring secondary - checking if catz survives another type of failed reconfiguration attempts ($n)"
+ret=0
+sed -e "s/^#T4//" < ns2/named1.conf.in > ns2/named.conf.tmp
+copy_setports ns2/named.conf.tmp ns2/named.conf
+$RNDC -c ../common/rndc.conf -s 10.53.0.2 -p "${CONTROLPORT}" reconfig > /dev/null 2>&1 && ret=1
+if [ $ret -ne 0 ]; then echo_i "failed"; fi
+status=$((status+ret))
+
+# catalog zone update can be deferred
+sleep 2
+
+n=$((n+1))
+echo_i "checking again that dom3.example. is served by secondary ($n)"
+ret=0
+wait_for_soa @10.53.0.2 dom3.example. dig.out.test$n || ret=1
+if [ $ret -ne 0 ]; then echo_i "failed"; fi
+status=$((status+ret))
+
+n=$((n+1))
+echo_i "reconfiguring secondary - reverting the bad configuration ($n)"
+ret=0
+copy_setports ns2/named1.conf.in ns2/named.conf
+rndccmd 10.53.0.2 reconfig || ret=1
+if [ $ret -ne 0 ]; then echo_i "failed"; fi
+status=$((status+ret))
+
+nextpart ns2/named.run >/dev/null
+
 n=$((n+1))
 echo_i "adding a domain dom-existing.example. to primary via RNDC ($n)"
 ret=0