Panels gets added to Row after expanding Row

i want to use Rows to to hide some panels while giving a general Overview with some Stat-Panels. But as soon as a Row is expanded and afterwards collapsed, all the panels in between the rows are getting added to the row, above when expanding.
How can I prevent the Panels be added to the row when the row is expanded?

Following , I want similar function

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Is there any statement, if this is a missing feature or a bug?

I honestly feel like, that panels getting added to rows just for expanding said rows is a bug.