diff --git a/platform/lang-impl/testSources/com/intellij/toolWindow/HideAllToolWindowsTest.kt b/platform/lang-impl/testSources/com/intellij/toolWindow/HideAllToolWindowsTest.kt
index b3f65385f804..3e122ae69d4a 100644
--- a/platform/lang-impl/testSources/com/intellij/toolWindow/HideAllToolWindowsTest.kt
+++ b/platform/lang-impl/testSources/com/intellij/toolWindow/HideAllToolWindowsTest.kt
@@ -1,6 +1,7 @@
 // Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package com.intellij.toolWindow
 
+import com.intellij.idea.IJIgnore
 import com.intellij.openapi.actionSystem.ActionManager
 import com.intellij.openapi.actionSystem.AnActionEvent
 import com.intellij.openapi.actionSystem.CommonDataKeys
@@ -13,6 +14,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.withContext
 
+@IJIgnore(issue = "AT-3959")
 class HideAllToolWindowsTest : ToolWindowManagerTestCase() {
   fun testDontHideFloatingAndWindowedToolWindows() {
     runBlocking {
diff --git a/platform/lang-impl/testSources/com/intellij/toolWindow/HideSidebarButtonTest.kt b/platform/lang-impl/testSources/com/intellij/toolWindow/HideSidebarButtonTest.kt
index e2c00f4a0cf0..f593f88b85cd 100644
--- a/platform/lang-impl/testSources/com/intellij/toolWindow/HideSidebarButtonTest.kt
+++ b/platform/lang-impl/testSources/com/intellij/toolWindow/HideSidebarButtonTest.kt
@@ -3,6 +3,7 @@
 
 package com.intellij.toolWindow
 
+import com.intellij.idea.IJIgnore
 import com.intellij.openapi.application.EDT
 import com.intellij.openapi.util.JDOMUtil
 import com.intellij.openapi.wm.ToolWindowEP
@@ -12,6 +13,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.withContext
 
+@IJIgnore(issue = "AT-3959")
 class HideSidebarButtonTest : ToolWindowManagerTestCase() {
   fun testHiddenButton() {
     runBlocking {
diff --git a/platform/lang-impl/testSources/com/intellij/toolWindow/ProjectToolWindowTest.kt b/platform/lang-impl/testSources/com/intellij/toolWindow/ProjectToolWindowTest.kt
index 8ebac2489486..a5ed57714aaf 100644
--- a/platform/lang-impl/testSources/com/intellij/toolWindow/ProjectToolWindowTest.kt
+++ b/platform/lang-impl/testSources/com/intellij/toolWindow/ProjectToolWindowTest.kt
@@ -3,6 +3,7 @@ package com.intellij.toolWindow
 
 import com.intellij.ide.projectView.ProjectView
 import com.intellij.ide.projectView.impl.ProjectViewState
+import com.intellij.idea.IJIgnore
 import com.intellij.openapi.application.EDT
 import com.intellij.openapi.wm.ToolWindowEP
 import com.intellij.openapi.wm.ToolWindowId
@@ -12,6 +13,7 @@ import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.withContext
 import org.assertj.core.api.Assertions.assertThat
 
+@IJIgnore(issue = "AT-3959")
 class ProjectToolWindowTest : ToolWindowManagerTestCase() {
   fun testProjectViewActivate() {
     if (ExperimentalUI.isNewUI()) {
diff --git a/platform/platform-tests/testSrc/com/intellij/openapi/progress/impl/BackgroundableProcessIndicatorTest.kt b/platform/platform-tests/testSrc/com/intellij/openapi/progress/impl/BackgroundableProcessIndicatorTest.kt
index 2dd5db39d3c9..a7c5d0bed50c 100644
--- a/platform/platform-tests/testSrc/com/intellij/openapi/progress/impl/BackgroundableProcessIndicatorTest.kt
+++ b/platform/platform-tests/testSrc/com/intellij/openapi/progress/impl/BackgroundableProcessIndicatorTest.kt
@@ -1,6 +1,7 @@
 // Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package com.intellij.openapi.progress.impl
 
+import com.intellij.idea.IJIgnore
 import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.components.ComponentManagerEx
 import com.intellij.openapi.progress.*
@@ -15,6 +16,7 @@ import kotlinx.coroutines.*
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.Assume.assumeFalse
 
+@IJIgnore(issue = "AT-3959")
 @SkipInHeadlessEnvironment
 class BackgroundableProcessIndicatorTest : ProgressWindowTestCase<Pair<Task.Backgroundable, BackgroundableProcessIndicator>>() {
   private lateinit var statusBar: IdeStatusBarImpl
diff --git a/plugins/kotlin/jvm-debugger/eval4j/test/org/jetbrains/eval4j/test/Eval4jTest.java b/plugins/kotlin/jvm-debugger/eval4j/test/org/jetbrains/eval4j/test/Eval4jTest.java
index dc0e817673dd..d059bb7c9384 100644
--- a/plugins/kotlin/jvm-debugger/eval4j/test/org/jetbrains/eval4j/test/Eval4jTest.java
+++ b/plugins/kotlin/jvm-debugger/eval4j/test/org/jetbrains/eval4j/test/Eval4jTest.java
@@ -5,6 +5,7 @@ package org.jetbrains.eval4j.test;
 import junit.framework.TestSuite;
 import org.jetbrains.eval4j.jdi.test.JdiTestKt;
 
+// @IJIgnore(issue = "AT-3959")
 public class Eval4jTest extends TestSuite {
 
     @SuppressWarnings({"UnnecessaryFullyQualifiedName", "StaticMethodReferencedViaSubclass"})
diff --git a/plugins/tasks/tasks-tests/test/com/intellij/tasks/context/EditorsContextTest.java b/plugins/tasks/tasks-tests/test/com/intellij/tasks/context/EditorsContextTest.java
index 153292b43655..2cbda38762fd 100644
--- a/plugins/tasks/tasks-tests/test/com/intellij/tasks/context/EditorsContextTest.java
+++ b/plugins/tasks/tasks-tests/test/com/intellij/tasks/context/EditorsContextTest.java
@@ -1,6 +1,7 @@
 // Copyright 2000-2022 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package com.intellij.tasks.context;
 
+import com.intellij.idea.IJIgnore;
 import com.intellij.openapi.editor.EditorFactory;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.testFramework.FileEditorManagerTestCase;
@@ -10,6 +11,7 @@ import org.jdom.Element;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+@IJIgnore(issue = "AT-3959")
 @SkipInHeadlessEnvironment
 public class EditorsContextTest extends FileEditorManagerTestCase {
   public void testDockableContainer() {