$modules property must be declared protected.

modules/core/api/tests/src/Functional/InstallTest.php

@@ -17,7 +17,7 @@ class InstallTest extends FarmBrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'simple_oauth',
     'farm_api',
 

modules/core/api/tests/src/Functional/OauthTestBase.php

@@ -19,7 +19,7 @@ class OauthTestBase extends TokenBearerFunctionalTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'image',
     'node',
     'serialization',

modules/core/asset/tests/src/Functional/AssetTestBase.php

@@ -14,7 +14,7 @@ abstract class AssetTestBase extends FarmBrowserTestBase {
    *
    * @var array
    */
-  public static $modules = [
+  protected static $modules = [
     'asset',
     'asset_test',
     'entity',

modules/core/dashboard/tests/src/Functional/DashboardTest.php

@@ -21,7 +21,7 @@ class DashboardTest extends FarmBrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'farm_dashboard',
     'farm_dashboard_test',
   ];

modules/core/field/tests/src/Kernel/FarmFieldTest.php

@@ -19,7 +19,7 @@ class FarmFieldTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'asset',
     'log',
     'farm_field',

modules/core/role/tests/src/Kernel/ManagedRolePermissionsTest.php

@@ -18,7 +18,7 @@ class ManagedRolePermissionsTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'system',
     'user',
     'log',

modules/core/ui/views/tests/src/Functional/DashboardTasksTest.php

@@ -36,7 +36,7 @@ class DashboardTasksTest extends FarmBrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'farm_observation',
     'farm_dashboard',
     'farm_ui_views',