Ilya Novikov
--- a/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
+++ b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
        'trim' => ['default' => FALSE],
        'preserve_tags' => ['default' => ''],
        'html' => ['default' => FALSE],
+        // Undefined keys used in code and in tests; not in schema.yml files.
--- a/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
+++ b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php

    // If the query and fragment were programmatically assigned overwrite any
    // parsed values.
-    if (isset($alter['query'])) {
+    // This code allows for possibility of extra keys in $alter not declared in
+    // defineOptions() or schema.yml.
+    if (!empty($alter['query'])) {
--- a/core/modules/views/src/Plugin/views/HandlerBase.php
+++ b/core/modules/views/src/Plugin/views/HandlerBase.php
  protected function defineOptions() {
    $options = parent::defineOptions();

+    $options['plugin_id'] = ['default' => ''];