If one types something like "file://foo/bar/baz" into the location bar (note: there are only two slashes following 'file:' while a correctly formatted URI has three, eg. "file:///foo/bar/baz" Dolphin pops up a dialog asking the user to input credentials for a (non-existent) SMB file share, which is... weird. Dolphin just seems to really hate if you forego the root directory slash - related bug 456170 Tested on a fresh live install ISO of KDE neon to confirm it's an OOTB issue.
I can confirm this. Typing in "file://home/tracey/filename.txt" resulted in an authentication pop up, which I'm attaching.
Created attachment 169354 [details] Samba authentication dialog
Reproduced on Operating System: Solus 4.5 KDE Plasma Version: 6.0.4 KDE Frameworks Version: 6.1.0 Qt Version: 6.6.3 Kernel Version: 6.8.9-289.current (64-bit) Graphics Platform: Wayland