When using hook_FORM_ID_alter(), with FORM_ID = menu_link_form or FORM_ID = menu_form (at least, maybe others as well), the form_alter hook is called twice (I'm wondering if it's because in these cases, FORM_ID = BASE_FORM_ID).

As a side note, when debugging the form, the class attribute contains two 'menu-form' (or 'menu_link_form') classes, and the '#theme' array contains twice the same key either.

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Simon Georges’s picture

Simon Georges CreditAttribution: Simon Georges commented

I've found #1768526: NodeFormController::validate() calls buildEntity() twice as a similar (or not?) issue...

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quietone’s picture

quietone CreditAttribution: quietone as a volunteer commented
Version: 8.9.x-dev » 9.3.x-dev
Issue summary: View changes
Status: Active » Closed (cannot reproduce)
Issue tags: +Bug Smash Initiative

@Simon Georges, Thank you for reporting this problem. We rely on issue reports like this to improve Drupal core.

I tested this on 9.3.x and was not able to reproduce this error. I created a test module and adding the hooks, setting breakpoints on menu forms. I tested adding a menu, editing a menu and the same for menu links. The hooks were not executing twice.

Therefore, closing as cannot reproduce. If you are experiencing this problem reopen the issue, by setting the status to 'Active', and provide complete steps to reproduce the issue (starting from "Install Drupal core").

Thanks!