I have an issue with a part of the patch :
implode('_', $element['#parents'])
This part does not work for me because i use sub index in my form for file type (#tree = TRUE).
If i replace this by :
array_shift($element['#parents'])
It works for me. What do you think about this?
https://www.drupal.org/files/issues/2021-11-30/59750-112.patch →