"Collapse this element's height when hidden" not working

I have a page with a header, two groups and a footer.
I’ve set “Collapse this element’s height when hidden” on the groups.
The groups are hidden by a condition, but the footer isn’t pulled upwards: the behavior is as if I hadn’t set this flag.

EDIT: I have investigated the problem better, and it depends on the groups slightly overlapping.
With this, I get the bug:

In this case, the groups collapse as intended.

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