Can't Quick Open multiple files at once anymore in 4.4

[Lippanon]

Tested versions

• v4.4.dev.custom_build [c6c464c]

System information

Windows 10 - Vulkan

Issue description

After the Quick Open panel change at some point in 4.4 I think, I can no longer multiple select different files to open, for example 'Quick Open Scripts', I used to be able to hold Shift or Control and select several files and then they'd all open.
With this new panel it no longer works, it just opens the one I click on:

Steps to reproduce

Scene -> Quick Open Script: try to select several files to open.

Minimal reproduction project (MRP)

Any

[Lippanon]

For reference, multiple files being selected to open in v4.3.stable.official [77dcf97]:

I think the redesign merge might have been #56772.
Is it a windows bug or loss of functionality?

[AThousandShips]

This was done by choice, see #56772 (comment)

But can be improved on