Clicking search breadcrumb exposes format field which can then be manipulated

When you click into a format specific search, it limits items to that format (no option to adjust).
I noticed however, when you click into a component then back out into the format specific search, a format field appears. This can then be manipulated and make non-format specific items appear in that search.
See vid.

I think this is regression but have not back checked beyond making sure it wasn't broken by what I was testing. Filing for analysis.