After the November updates, Dolphin stopped showing samba shares from other PCs on the network.
However! The samba network works correctly as I can easily access it by making the call manually with the command smb://eragontux@192.168.1.142/Dell_Studio/ .
For KDE Plasma 6, network browsing in Dolphin is provided by kio-extras. However, Windows host discovery previously relied on WS-Discovery via the kdsoap-ws-discovery-client library, which did work in earlier Plasma 5 releases . That component no longer appears to be included in current KDE Frameworks 6 / Plasma 6 stacks, so the WS-Discovery-based discovery path is no longer available. I’m not yet sure if this is openSUSE-specific, or an upstream decision. I think a bug report is required.
Avahi discovery (Linux hosts) should still work though.
I have to retract the WS-Discovery comments…I’ve just tested Plasma 6 Dolphin discovery (Slowroll), and WS-Discovery of a Windows host I have at hand is working as expected. (It can take a few moments for the network discovery to work, but the host is eventually enumerated.)
I also monitored WS‑Discovery traffic on UDP port 3702 to my host, showing the Windows host responding with ProbeMatches…