diff --git a/core/modules/views/src/Plugin/views/filter/Date.php b/core/modules/views/src/Plugin/views/filter/Date.php
index ec951f08cd..baa27b70f4 100644
--- a/core/modules/views/src/Plugin/views/filter/Date.php
+++ b/core/modules/views/src/Plugin/views/filter/Date.php
@@ -182,6 +182,9 @@ protected function opBetween($field) {
   }
 
   protected function opSimple($field) {
+    // @todo $this->value['value'] should always be defined, but it's not
+    // and that's leading to test failures in PHP 7.4. Figure out a more
+    // robust solution rather than coalescing to NULL.
     $value = intval(strtotime($this->value['value'] ?? NULL, 0));
     if (!empty($this->value['type']) && $this->value['type'] == 'offset') {
       // Keep sign.
diff --git a/core/modules/views/src/Plugin/views/filter/NumericFilter.php b/core/modules/views/src/Plugin/views/filter/NumericFilter.php
index 71aadbfba2..4f9680ec57 100644
--- a/core/modules/views/src/Plugin/views/filter/NumericFilter.php
+++ b/core/modules/views/src/Plugin/views/filter/NumericFilter.php
@@ -354,6 +354,9 @@ protected function opBetween($field) {
   }
 
   protected function opSimple($field) {
+    // @todo $this->value['value'] should always be defined, but it's not
+    // and that's leading to test failures in PHP 7.4. Figure out a more
+    // robust solution rather than coalescing to NULL.
     $this->query->addWhere($this->options['group'], $field, $this->value['value'] ?? NULL, $this->operator);
   }
 
diff --git a/core/modules/views/src/Plugin/views/join/JoinPluginBase.php b/core/modules/views/src/Plugin/views/join/JoinPluginBase.php
index dcb445d053..1788ec63a7 100644
--- a/core/modules/views/src/Plugin/views/join/JoinPluginBase.php
+++ b/core/modules/views/src/Plugin/views/join/JoinPluginBase.php
@@ -263,6 +263,9 @@ public function buildJoin($select_query, $table, $view_query) {
 
     if ($this->leftTable) {
       $left_table = $view_query->getTableInfo($this->leftTable);
+      // @todo $left_table['alias'] should always be defined, but it's not
+      // and that's leading to test failures in PHP 7.4. Figure out a more
+      // robust solution rather than coalescing to NULL.
       $left_table_alias = $left_table['alias'] ?? NULL;
       $left_field = "$left_table_alias.$this->leftField";
     }
@@ -382,6 +385,9 @@ protected function buildExtra($info, &$arguments, $table, SelectInterface $selec
       // Allow the value to be set either with the 'value' element or
       // with 'left_field'.
       if (isset($info['left_field'])) {
+        // @todo $left['alias'] should always be defined, but it's not
+        // and that's leading to test failures in PHP 7.4. Figure out a more
+        // robust solution rather than coalescing to NULL.
         $left_alias = $left['alias'] ?? NULL;
         $placeholder_sql = "$left_alias.$info[left_field]";
       }