#StackBounty: #8 #forms #blocks Change value on validate form when I create or edit a block

Bounty: 50

I need change a value to element on form validation.

I have this code:

 * Implements hook_form_FORM_alter().
function MY_MODULE_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if ($form_id == 'block_content_MY_BLOCK_form' || $form_id == 'block_content_MY_BLOCK_edit_form') {
    $form['#validate'][] = '_custom_validate';

I want change the value of field field_test. This field is plain text.

function _custom_validate($form, FormStateInterface $form_state) {
  $form_state->setValueForElement($form['field_test'], 'changed');

But when I saved this block, the field field_test doesn’t change its value.

What I am doing wrong?

Get this bounty!!!

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