How to make children of TabContainer resize like other nested containers?

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:bust_in_silhouette: Asked By Alexander Slesarenko

Nested TabContainer screenshot
I want Tab1 to fill the width of VBoxContainer whatever size it has, but it doesn’t behave like nested container. Is this a bug or I don’t understand something?
This scene as .tscn file

:bust_in_silhouette: Reply From: Alexander Slesarenko

It’s a bug