diff --git a/.idea/dictionaries/kevint.xml b/.idea/dictionaries/kevint.xml
index fbe5c1bed..b4b5a4cef 100644
--- a/.idea/dictionaries/kevint.xml
+++ b/.idea/dictionaries/kevint.xml
@@ -4,6 +4,7 @@
       <w>bellsoft</w>
       <w>cooldown</w>
       <w>liberica</w>
+      <w>spdx</w>
       <w>terasology</w>
     </words>
   </dictionary>
diff --git a/build.gradle b/build.gradle
index 63aff1e61..6d11f3fe0 100644
--- a/build.gradle
+++ b/build.gradle
@@ -118,7 +118,7 @@ dependencies {
     }
     testImplementation "org.mockito:mockito-junit-jupiter:3.3.+"
 
-    testImplementation('org.spf4j:spf4j-slf4j-test:8.8.+') {
+    testImplementation('org.spf4j:spf4j-slf4j-test:8.8.5') {
         because "testable logging"
     }
     testImplementation("org.slf4j:slf4j-api:1.7.+!!") {
diff --git a/src/test/java/org/terasology/launcher/game/TestRunGameTask.java b/src/test/java/org/terasology/launcher/game/TestRunGameTask.java
index 68f220810..b42345571 100644
--- a/src/test/java/org/terasology/launcher/game/TestRunGameTask.java
+++ b/src/test/java/org/terasology/launcher/game/TestRunGameTask.java
@@ -4,6 +4,7 @@
 package org.terasology.launcher.game;
 
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
+import javafx.application.Platform;
 import javafx.concurrent.WorkerStateEvent;
 import javafx.util.Pair;
 import org.junit.jupiter.api.AfterEach;
@@ -223,7 +224,8 @@ public void testSuccessEvent() throws Exception {
                 Happenings.TASK_COMPLETED.val()
         );
 
-        final Runnable handleLineSent = () -> actualHistory.add(Happenings.PROCESS_OUTPUT_LINE.val());
+        final Runnable handleLineSent = () -> Platform.runLater(
+                () -> actualHistory.add(Happenings.PROCESS_OUTPUT_LINE.val()));
 
         // This makes our "process," which streams out its lines and runs the callback after each.
         final Process lineAtATimeProcess = new MockProcesses.OneLineAtATimeProcess(
@@ -245,11 +247,10 @@ public void testSuccessEvent() throws Exception {
         // Act!
         executor.submit(gameTask);
 
-        WaitForAsyncUtils.waitForFxEvents();
-
         var actualReturnValue = gameTask.get();  // task.get blocks until it has run to completion
 
         // Assert!
+        WaitForAsyncUtils.waitForFxEvents();
         assertTrue(actualReturnValue);
 
         assertIterableEquals(expectedHistory, actualHistory, renderColumns(actualHistory, expectedHistory));
@@ -271,7 +272,8 @@ public void testFastExitDoesNotResultInSuccess() {
                 Happenings.TASK_FAILED.val()
         );
 
-        final Runnable handleLineSent = () -> actualHistory.add(Happenings.PROCESS_OUTPUT_LINE.val());
+        final Runnable handleLineSent = () -> Platform.runLater(
+                () -> actualHistory.add(Happenings.PROCESS_OUTPUT_LINE.val()));
 
         // This makes our "process," which streams out its lines and runs the callback after each.
         final Process lineAtATimeProcess = new MockProcesses.OneLineAtATimeProcess(
@@ -297,9 +299,9 @@ public void testFastExitDoesNotResultInSuccess() {
         // Act!
         executor.submit(gameTask);
 
-        WaitForAsyncUtils.waitForFxEvents();
-
         var thrown = assertThrows(ExecutionException.class, gameTask::get);
+
+        WaitForAsyncUtils.waitForFxEvents();
         assertThat(thrown.getCause(), instanceOf(RunGameTask.GameExitTooSoon.class));
 
         assertIterableEquals(expectedHistory, actualHistory, renderColumns(actualHistory, expectedHistory));