Duplicated fields with field_group on referenced ECK entities

I can confirm the same issue in Drupal 8.

Issue seems for 8, I'm getting it in 7 as well.
I haven't tried field groups in 7 yet though I have read the docs and know the basics of how it's changed - how you only add the names of the fields to the group array instead of putting the field definition arrays inside it, as is the case with fieldsets, and what I remember doing in previous versions of Drupal.

Here, it does appear as if the appropriate FormAPI elements are present, with the fields I moved into the fieldgroup named in a [#group] array. So it appears that trying to insert the code with hook_form_alter() isn't likely to work either.

I haven't yet tried moving the elements into a fieldset with a module. I'll probably try that soon and report back here so people know if that's an option.

Reporting back: Just found a workaround: switching the type of fieldgroup to fieldset yields a fieldset which can either be collapsible or collapsed - and note, this is with the fieldgroup module, and not by fiddling with hook_form_alter() - just hit the little gear and pick fieldset.

Workaround in #4 does not work in Drupal 8.4.2, with Field Group version 8.x-3.0-beta1. The duplicate field is just placed below the fieldset.

I have same issue, is there any solution ?

Perhaps the reason may be something like this?

• #2942234: Does not work with commerce or other entities without a "content" render array key
• #2859858: Field group doesn't work with custom entity

Related issue?

I dig it a lot and... the best solution I found until this moment is to patch field_group_entity_view_alter
Looks like that hook_entity_view_alter is called multiple time

EDIT: wrong patch sorry

Issue getting a little old. Core and this module have moved on. Perhaps we not make sure patches apply against latest dev version?

Hi Stein, the provided patch solves the problem for me with
- drupal 8.5.4
- field_group 8.x-3.x-dev
- eck 8.x-1.0-alpha3

Changing the title of the issue to "Duplicated fields with field_group on referenced entities" since the problem is visible if you set up a field group on an ECK entity that is referenced by a node: on the node view you see duplicated fields right after the field group.

I added a screenshot to the description to help illustrate the bug.

The provided patch worked for me as well when I tested with:
- Drupal 8.5.5,
- field_group 8.x-3.0-beta1
- ECK 8.x-1.0-alpha3

Are there other steps needed? For now I'm marking it as RTBC.

Changed the title to indicate that this is specific to integration with ECK module.

The patch is not ok, as it will cause to nest 2 times for all other entity types. The main issue is probably that field_group_theme_registry_alter needs to be updated for eck support. There is code for eck, but it probably needs an update.

The rendering is working completely, but there is an issue with the default properties of eck (like title). It's correctly grouped, but the element has a 'printed' value set to true. That's the reason why the title is not appearing. All other mentioned issues, are ok for me on latest dev.

Issue should be fixed in dev