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Disabling Flag link access on view

I have a custom entity displayed in a view. If some field is of a certain value, the Flag link should not be available and replaced by some text.

function my_module_preprocess_flag(&$vars){   $f = Drupal::service('flag.link_builder');   if ($vars["flaggable"]->field_my_field->getValue() != null) {     if ($vars["flaggable"]->field_my_field->getValue()[0]["value"] == "0") {       $link = $f->build('flag', $vars['flag']->id(), 'buy');       $link["#access"] = FALSE;      }   } }

Nothing seems to happen.

What could be the solution here?

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Disabling Flag link access on view

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