FormComponentContainer anchoring only works partially

[og1]

The Bootstrap Components - FormComponentContainer has an anchoring bug.
The Servoy Default - FormComponentContainer does not.

I made a form component with two buttons and a field (as a workaround for the input_group height bug).
The left button is anchored top, left.
The field is anchored top, left, right.
The right button is anchored top, right.

When resizing the FormComponentContainer the Servoy component anchors the way it should and the Bootstrap component does not. Besides that, resize changes are not reflected in the designer for either component.