Nesting CondensedInlinePanel on snippet, nested panels do not show up

[CriticalNameError]

I would like to nest a CondensedInlinePanel inside another CondensedInlinePanel on a Snippet.

It works fine with standard InlinePanel. When I exchange it with CondensedInlinePanel, the top layer displays fine (except there are old and new add buttons) but the nested one(s) do not show up in the GUI.

Is CondensedInlinePanel supposed to work for my use case?

If so, I would construct a minimal example in order to reproduce the issue to further investigate it.

After exchanging InlinePanel with CondensedInlinePanel:

[itraveribon]

I am suffering the same problem. I could not find any solution until now.