Field group configuration assigned to wrong view mode

Let's take content types Page and Article.
Page has an entity reference field to Article (called field_articles).

Article has 2 form modes, Default and Inline.
On Default form, the title field is in a Tab field-group called "Basic", with a parent Tabs group called Tabs (Tabs > Basic > field_articles).
On Inline form, there is no group at all, and title is the only field enabled on the form.

On Page Default form, field_articles is configured to use "Inline entity form - Complex", with view mode Inline.
Problem: it stills picks-up the field configuration from Article/Default form, and the title fields ends-up under a Basic tab that magically appears.

I understand that IEF picks-up the field-group configuration from Default form, regardless of the fact that I am using the Inline form.

Can anyone reproduce the issue?

Best regards,
Renaud