The plasma-nm applet still shows a "WiFi Disconnected" icon in the system tray (the one with yellow "?" sign), although I am connected to wifi. However, It shows a correct icon and "Connected to ..." message in the tooltip, and in the applet itself. Reproducible: Always This is clearly a regression, it appeared after an upgrade to Plasma 5.7.95.
Do you have NetworkManager 1.4.0? If so, it's bug 367938.
The versions are following: NetworkManager 1.4.0 networkmanager-qt 5.26.0 plasma-nm 5.7.95 The nm-qt patch from the bug 367938 fixed the issue for me. Sorry for the noise! *** This bug has been marked as a duplicate of bug 367938 ***