diff --git a/core/src/main/java/jenkins/ErrorAttributeFilter.java b/core/src/main/java/jenkins/ErrorAttributeFilter.java
index 9163e409f61d..be67bdab7588 100644
--- a/core/src/main/java/jenkins/ErrorAttributeFilter.java
+++ b/core/src/main/java/jenkins/ErrorAttributeFilter.java
@@ -3,6 +3,7 @@
 import java.io.IOException;
 import javax.servlet.Filter;
 import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
 import javax.servlet.ServletException;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletResponse;
@@ -27,4 +28,14 @@ public void doFilter(ServletRequest servletRequest, ServletResponse servletRespo
         servletRequest.setAttribute(USER_ATTRIBUTE, authentication);
         filterChain.doFilter(servletRequest, servletResponse);
     }
+
+    @Override
+    public void destroy() {
+        // Otherwise the PCT fails
+    }
+
+    @Override
+    public void init(FilterConfig filterConfig) throws ServletException {
+        // Otherwise the PCT fails
+    }
 }
diff --git a/test/pom.xml b/test/pom.xml
index 5faa39fff2b0..75035b367d83 100644
--- a/test/pom.xml
+++ b/test/pom.xml
@@ -101,7 +101,7 @@ THE SOFTWARE.
         <!-- requireUpperBoundDeps via matrix-project and junit -->
         <groupId>org.jenkins-ci.plugins</groupId>
         <artifactId>script-security</artifactId>
-        <version>1271.vdede89739a_81</version>
+        <version>1273.v66c1964f0dfd</version>
       </dependency>
     </dependencies>
   </dependencyManagement>
diff --git a/test/src/test/java/hudson/model/CauseTest.java b/test/src/test/java/hudson/model/CauseTest.java
index 4f4fba4e8121..0d4caf54f61b 100644
--- a/test/src/test/java/hudson/model/CauseTest.java
+++ b/test/src/test/java/hudson/model/CauseTest.java
@@ -61,10 +61,11 @@ public class CauseTest {
     @Test public void deeplyNestedCauses() throws Exception {
         FreeStyleProject a = j.createFreeStyleProject("a");
         FreeStyleProject b = j.createFreeStyleProject("b");
-        Run<?, ?> early = null;
-        Run<?, ?> last = null;
+        FreeStyleBuild early = null;
+        FreeStyleBuild last = null;
+        List<QueueTaskFuture<FreeStyleBuild>> futures = new ArrayList<>();
         for (int i = 1; i <= 15; i++) {
-            last = b.scheduleBuild2(0, new Cause.UpstreamCause((Run<?, ?>) a.scheduleBuild2(0, last == null ? null : new Cause.UpstreamCause(last)).get())).get();
+            last = recordFuture(b.scheduleBuild2(0, new Cause.UpstreamCause(recordFuture(a.scheduleBuild2(0, last == null ? null : new Cause.UpstreamCause(last)), futures).get())), futures).get();
             if (i == 5) {
                 early = last;
             }
@@ -73,6 +74,9 @@ public class CauseTest {
         assertTrue("keeps full history:\n" + buildXml, buildXml.contains("<upstreamBuild>1</upstreamBuild>"));
         buildXml = new XmlFile(Run.XSTREAM, new File(last.getRootDir(), "build.xml")).asString();
         assertFalse("too big:\n" + buildXml, buildXml.contains("<upstreamBuild>1</upstreamBuild>"));
+        for (QueueTaskFuture<FreeStyleBuild> future : futures) {
+            j.assertBuildStatusSuccess(j.waitForCompletion(future.waitForStart()));
+        }
     }
 
     @Issue("JENKINS-15747")
@@ -84,17 +88,14 @@ public class CauseTest {
         Run<?, ?> last = null;
         for (int i = 1; i <= 10; i++) {
             Cause cause = last == null ? null : new Cause.UpstreamCause(last);
-            QueueTaskFuture<FreeStyleBuild> next1 = a.scheduleBuild2(0, cause);
-            futures.add(next1);
-            futures.add(a.scheduleBuild2(0, cause));
+            QueueTaskFuture<FreeStyleBuild> next1 = recordFuture(a.scheduleBuild2(0, cause), futures);
+            recordFuture(a.scheduleBuild2(0, cause), futures);
             cause = new Cause.UpstreamCause(next1.get());
-            QueueTaskFuture<FreeStyleBuild> next2 = b.scheduleBuild2(0, cause);
-            futures.add(next2);
-            futures.add(b.scheduleBuild2(0, cause));
+            QueueTaskFuture<FreeStyleBuild> next2 = recordFuture(b.scheduleBuild2(0, cause), futures);
+            recordFuture(b.scheduleBuild2(0, cause), futures);
             cause = new Cause.UpstreamCause(next2.get());
-            QueueTaskFuture<FreeStyleBuild> next3 = c.scheduleBuild2(0, cause);
-            futures.add(next3);
-            futures.add(c.scheduleBuild2(0, cause));
+            QueueTaskFuture<FreeStyleBuild> next3 = recordFuture(c.scheduleBuild2(0, cause), futures);
+            recordFuture(c.scheduleBuild2(0, cause), futures);
             last = next3.get();
         }
         int count = new XmlFile(Run.XSTREAM, new File(last.getRootDir(), "build.xml")).asString().split(Pattern.quote("<hudson.model.Cause_-UpstreamCause")).length;
@@ -105,6 +106,10 @@ public class CauseTest {
         }
     }
 
+    private static QueueTaskFuture<FreeStyleBuild> recordFuture(QueueTaskFuture<FreeStyleBuild> future, List<QueueTaskFuture<FreeStyleBuild>> futures) {
+        futures.add(future);
+        return future;
+    }
 
     @Issue("JENKINS-48467")
     @Test public void userIdCausePrintTest() throws Exception {
diff --git a/test/src/test/java/hudson/model/queue/MaintainCanTakeStrengtheningTest.java b/test/src/test/java/hudson/model/queue/MaintainCanTakeStrengtheningTest.java
index a9c64db9756e..c9deee7aac73 100644
--- a/test/src/test/java/hudson/model/queue/MaintainCanTakeStrengtheningTest.java
+++ b/test/src/test/java/hudson/model/queue/MaintainCanTakeStrengtheningTest.java
@@ -4,13 +4,13 @@
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.hasItem;
 
+import hudson.model.FreeStyleBuild;
 import hudson.model.FreeStyleProject;
 import hudson.model.Label;
 import hudson.model.Node;
 import hudson.model.Queue;
 import hudson.slaves.DumbSlave;
 import hudson.slaves.NodeProperty;
-import java.util.concurrent.TimeUnit;
 import java.util.logging.Level;
 import org.junit.Rule;
 import org.junit.Test;
@@ -26,7 +26,7 @@ public class MaintainCanTakeStrengtheningTest {
     @Rule
     public LoggerRule logging = new LoggerRule().record(Node.class.getName(), Level.ALL).capture(100);
 
-    private QueueTaskFuture scheduleBuild(String name, String label) throws Exception {
+    private QueueTaskFuture<FreeStyleBuild> scheduleBuild(String name, String label) throws Exception {
         FreeStyleProject project = r.createFreeStyleProject(name);
 
         project.setAssignedLabel(Label.get(label));
@@ -44,15 +44,9 @@ public void testExceptionOnNodeProperty() throws Exception {
         r.createOnlineSlave(Label.get("good"));
 
         // Only the good ones will be run and the latest doesn't get hung because of the second
-        QueueTaskFuture[] taskFuture = new QueueTaskFuture[3];
-        taskFuture[0] = scheduleBuild("good1", "good");
-        taskFuture[1] = scheduleBuild("theFaultyOne", "faulty");
-        taskFuture[2] = scheduleBuild("good2", "good");
-
-        // Wait for a while until the good ones start, no need to wait for their completion to guarantee
-        // the fix works
-        taskFuture[0].getStartCondition().get(15, TimeUnit.SECONDS);
-        taskFuture[2].getStartCondition().get(15, TimeUnit.SECONDS);
+        FreeStyleBuild good1 = scheduleBuild("good1", "good").waitForStart();
+        scheduleBuild("theFaultyOne", "faulty");
+        FreeStyleBuild good2 = scheduleBuild("good2", "good").waitForStart();
 
         // The faulty one is the only one in the queue
         assertThat(r.getInstance().getQueue().getBuildableItems().size(), equalTo(1));
@@ -60,6 +54,10 @@ public void testExceptionOnNodeProperty() throws Exception {
 
         // The new error is shown in the logs
         assertThat(logging.getMessages(), hasItem(String.format("Exception evaluating if the node '%s' can take the task '%s'", faultyAgent.getDisplayName(), "theFaultyOne")));
+
+        // Tear down
+        r.assertBuildStatusSuccess(r.waitForCompletion(good1));
+        r.assertBuildStatusSuccess(r.waitForCompletion(good2));
     }
 
     /**
diff --git a/war/src/main/scss/abstracts/_theme.scss b/war/src/main/scss/abstracts/_theme.scss
index abc5fd3cb928..2ea8f434481d 100644
--- a/war/src/main/scss/abstracts/_theme.scss
+++ b/war/src/main/scss/abstracts/_theme.scss
@@ -116,8 +116,8 @@ $semantics: (
   // Deprecated - Button primary
   --button-color--primary: var(--background);
   --btn-primary-bg: #063f61;
-  --btn-primary-bg-hover: lighten(#063f61, 7.5%);
-  --btn-primary-bg-active: lighten(#063f61, 12%);
+  --btn-primary-bg-hover: #{lighten(#063f61, 7.5%)};
+  --btn-primary-bg-active: #{lighten(#063f61, 12%)};
   // Deprecated - Button primary
   --btn-secondary-color: var(--secondary);
   --btn-secondary-bg: var(--btn-text-color);