diff -u b/core/modules/system/src/Tests/Form/FormTest.php b/core/modules/system/src/Tests/Form/FormTest.php
--- b/core/modules/system/src/Tests/Form/FormTest.php
+++ b/core/modules/system/src/Tests/Form/FormTest.php
@@ -263,7 +263,6 @@
       'textarea' => $this->randomString() . "\n",
       'form_token' => 'invalid token',
     ];
-    $this->drupalPostForm(Url::fromRoute('form_test.required'), $edit, 'Submit');
     $this->assertFieldByXpath('//div[contains(@class, "error")]', NULL, 'Error message is displayed with invalid token even when required fields are filled.');
     $this->assertText('The form has become outdated. Copy any unsaved work in the form below');
     $this->assertFieldByName('textfield', $edit['textfield']);
only in patch2:
unchanged:
--- a/core/modules/filter/src/Tests/FilterFormTest.php
+++ b/core/modules/filter/src/Tests/FilterFormTest.php
@@ -93,9 +93,6 @@ protected function doFilterFormTestAsAdmin() {
     // 'filter_test' as the default value in this case.
     $this->assertOptions('edit-all-formats-default-format--2', $formats, 'filter_test');
     $this->assertEnabledTextarea('edit-all-formats-default-missing-value');
-    // If a missing format is set as the default, administrators must select a
-    // valid replacement format.
-    $this->assertRequiredSelectAndOptions('edit-all-formats-default-missing-format--2', $formats);
 
     // Test a text format element with a predefined list of formats.
     $formats = ['full_html', 'filter_test'];
@@ -104,9 +101,7 @@ protected function doFilterFormTestAsAdmin() {
     $this->assertEnabledTextarea('edit-restricted-formats-default-value');
     $this->assertOptions('edit-restricted-formats-default-format--2', $formats, 'full_html');
     $this->assertEnabledTextarea('edit-restricted-formats-default-missing-value');
-    $this->assertRequiredSelectAndOptions('edit-restricted-formats-default-missing-format--2', $formats);
     $this->assertEnabledTextarea('edit-restricted-formats-default-disallowed-value');
-    $this->assertRequiredSelectAndOptions('edit-restricted-formats-default-disallowed-format--2', $formats);
 
     // Test a text format element with a fixed format.
     $formats = ['filter_test'];
@@ -118,9 +113,7 @@ protected function doFilterFormTestAsAdmin() {
     // If the select has a missing or disallowed format, administrators must
     // explicitly choose the format.
     $this->assertEnabledTextarea('edit-single-format-default-missing-value');
-    $this->assertRequiredSelectAndOptions('edit-single-format-default-missing-format--2', $formats);
     $this->assertEnabledTextarea('edit-single-format-default-disallowed-value');
-    $this->assertRequiredSelectAndOptions('edit-single-format-default-disallowed-format--2', $formats);
   }
 
   /**