Filter "Design files" in Recents does not show files with branches

Hey folks,
I was looking for a way to increase the value of the screen “recents” for me. Once I found the filter options to only show “Design files” I couldn’t see file with branches anymore. Branched files are only visible within all files – and since there is no separate filter for this subtype, I would expect them to show up among “Design files”.

I checked this behavior with my colleagues and can confirm it within our team. Is this a bug?

Best,
Sven