diff --git a/cmd/prune-junit-xml/prunexml.go b/cmd/prune-junit-xml/prunexml.go
index 5da06e3b235..21d0b0fa312 100644
--- a/cmd/prune-junit-xml/prunexml.go
+++ b/cmd/prune-junit-xml/prunexml.go
@@ -135,6 +135,8 @@ func pruneTESTS(suites *junitxml.JUnitTestSuites) {
 		updatedTestcase.Classname = match[1]
 		updatedTestcase.Name = match[2]
 		updatedTestcase.Time = suite.Time
+		updatedSystemOut := ""
+		updatedSystemErr := ""
 		for _, testcase := range suite.TestCases {
 			// The top level testcase element in a JUnit xml file does not have the / character.
 			if testcase.Failure != nil {
@@ -142,10 +144,14 @@ func pruneTESTS(suites *junitxml.JUnitTestSuites) {
 				updatedTestcaseFailure.Message = joinTexts(updatedTestcaseFailure.Message, testcase.Failure.Message)
 				updatedTestcaseFailure.Contents = joinTexts(updatedTestcaseFailure.Contents, testcase.Failure.Contents)
 				updatedTestcaseFailure.Type = joinTexts(updatedTestcaseFailure.Type, testcase.Failure.Type)
+				updatedSystemOut = joinTexts(updatedSystemOut, testcase.SystemOut)
+				updatedSystemErr = joinTexts(updatedSystemErr, testcase.SystemErr)
 			}
 		}
 		if failflag {
 			updatedTestcase.Failure = &updatedTestcaseFailure
+			updatedTestcase.SystemOut = updatedSystemOut
+			updatedTestcase.SystemErr = updatedSystemErr
 		}
 		suite.TestCases = append(updatedTestcases, updatedTestcase)
 		updatedTestsuites = append(updatedTestsuites, suite)
@@ -153,8 +159,15 @@ func pruneTESTS(suites *junitxml.JUnitTestSuites) {
 	suites.Suites = updatedTestsuites
 }
 
-// joinTexts returns "<a>; <b>" if both are non-empty,
+// joinTexts returns "<a><empty line><b>" if both are non-empty,
 // otherwise just the non-empty string, if there is one.
+//
+// If <b> is contained completely in <a>, <a> gets returned because repeating
+// exactly the same string again doesn't add any information. Typically
+// this occurs when joining the failure message because that is the fixed
+// string "Failed" for all tests, regardless of what the test logged.
+// The test log output is typically different because it cointains "=== RUN
+// <test name>" and thus doesn't get dropped.
 func joinTexts(a, b string) string {
 	if a == "" {
 		return b
@@ -162,7 +175,14 @@ func joinTexts(a, b string) string {
 	if b == "" {
 		return a
 	}
-	return a + "; " + b
+	if strings.Contains(a, b) {
+		return a
+	}
+	sep := "\n"
+	if !strings.HasSuffix(a, "\n") {
+		sep = "\n\n"
+	}
+	return a + sep + b
 }
 
 func fetchXML(xmlReader io.Reader) (*junitxml.JUnitTestSuites, error) {
diff --git a/cmd/prune-junit-xml/prunexml_test.go b/cmd/prune-junit-xml/prunexml_test.go
index 6d40f5e8a9c..3dde79a0691 100644
--- a/cmd/prune-junit-xml/prunexml_test.go
+++ b/cmd/prune-junit-xml/prunexml_test.go
@@ -100,7 +100,10 @@ func TestPruneTESTS(t *testing.T) {
 		<properties>
 			<property name="go.version" value="go1.18 linux/amd64"></property>
 		</properties>
-		<testcase classname="k8s.io/kubernetes/test/integration/apimachinery2" name="TestWatchRestartsIfTimeoutNotReached/group/InformerWatcher_survives_closed_watches" time="30.050000"></testcase>
+		<testcase classname="k8s.io/kubernetes/test/integration/apimachinery2" name="TestWatchRestartsIfTimeoutNotReached/group/InformerWatcher_survives_closed_watches" time="30.050000">
+			<system-out>out A</system-out>
+			<system-err>err B</system-err>
+                </testcase>
 		<testcase classname="k8s.io/kubernetes/test/integration/apimachinery2" name="TestSchedulerInformers" time="-0.000000">
 			<failure message="FailedA" type="">FailureContentA</failure>
 		</testcase>
@@ -108,6 +111,24 @@ func TestPruneTESTS(t *testing.T) {
 			<failure message="FailedB" type="">FailureContentB</failure>
 		</testcase>
 	</testsuite>
+	<testsuite tests="3" failures="3" time="40.050000" name="k8s.io/kubernetes/test/integration/apimachinery3" timestamp="">
+		<properties>
+			<property name="go.version" value="go1.18 linux/amd64"></property>
+		</properties>
+		<testcase classname="k8s.io/kubernetes/test/integration/apimachinery3" name="TestWatchRestartsIfTimeoutNotReached/group/InformerWatcher_survives_closed_watches" time="40.050000">
+			<failure message="Failed" type="">RUNNING TestWatchRestartsIfTimeoutNotReached/group/InformerWatcher_survives_closed_watchesA&#xA;expected foo, got bar</failure>
+			<system-out>out A</system-out>
+			<system-err>err A</system-err>
+                </testcase>
+		<testcase classname="k8s.io/kubernetes/test/integration/apimachinery3" name="TestWatchRestartsIfTimeoutNotReached/group" time="40.050000">
+			<failure message="Failed" type="">sub-test failed</failure>
+			<system-out>out B</system-out>
+			<system-err>err B</system-err>
+		</testcase>
+		<testcase classname="k8s.io/kubernetes/test/integration/apimachinery3" name="TestWatchRestartsIfTimeoutNotReached" time="40.050000">
+			<failure message="Failed" type="">sub-test failed</failure>
+		</testcase>
+	</testsuite>
 </testsuites>`
 
 	outputXML := `<?xml version="1.0" encoding="UTF-8"?>
@@ -131,7 +152,17 @@ func TestPruneTESTS(t *testing.T) {
 			<property name="go.version" value="go1.18 linux/amd64"></property>
 		</properties>
 		<testcase classname="k8s.io/kubernetes/test/integration" name="apimachinery2" time="30.050000">
-			<failure message="FailedA; FailedB" type="">FailureContentA; FailureContentB</failure>
+			<failure message="FailedA&#xA;&#xA;FailedB" type="">FailureContentA&#xA;&#xA;FailureContentB</failure>
+		</testcase>
+	</testsuite>
+	<testsuite tests="3" failures="3" time="40.050000" name="k8s.io/kubernetes/test/integration/apimachinery3" timestamp="">
+		<properties>
+			<property name="go.version" value="go1.18 linux/amd64"></property>
+		</properties>
+		<testcase classname="k8s.io/kubernetes/test/integration" name="apimachinery3" time="40.050000">
+			<failure message="Failed" type="">RUNNING TestWatchRestartsIfTimeoutNotReached/group/InformerWatcher_survives_closed_watchesA&#xA;expected foo, got bar&#xA;&#xA;sub-test failed</failure>
+			<system-out>out A&#xA;&#xA;out B</system-out>
+			<system-err>err A&#xA;&#xA;err B</system-err>
 		</testcase>
 	</testsuite>
 </testsuites>`