Vertical stack with horizontal-stacks

[PierreScerri]

The image below shows a vertical stack containing 8 horizontal stacks of buttons and 2 custom:bar-cards.

When I add:

in_card: true

I get:

It seems that horizontal-stack is messing up the vertical spacing.

[zen2]

I got a similar problem but without horizontal-stack.
In my case it's several vertical-stack inside a vertical-stack using "the in-card: true":

 - type: vertical-stack
    in_card: true
    cards:
    - type: vertical-stack
      cards:
      ....
    - type: vertical-stack
      cards:
      ....
    - type: vertical-stack
      cards:
      ....

Without in-card option, spaces are perfect:

Whit in-card option, there is overlapping:

So it seems that the vertical spacing is messed up when we use several level of vertical-stack or horizontal-stack with in-card option set to the top level.