I have what I think is the same bug. When the passwords do not show in the NetworkManager "Connections" configuration panel, an error popup shows "Failed to get secrets for <SSID>. No agents were available for this request." Strangely, if a connection is added through nmcli with "nmcli device wifi connect ...", opening the connection in the configuration panel asks for the root password, and the secrets are then displayed correctly. I attach the system journal for 2 attempts to connect to "eduroam". Here's also the versions of a few potentially related packages: plasma-framework-5.49.0-1.1.x86_64 plasma-nm5-5.13.5-1.1.x86_64 kwalletd5-5.49.0-1.1.x86_64 kwalletmanager5-18.08.1-1.1.x86_64 kwalletmanager-15.04.3-2.12.x86_64 kwallet-tools-5.49.0-1.1.x86_64 NetworkManager-1.12.2-1.2.x86_64 NetworkManager-applet-1.8.18-1.1.x86_64 NetworkManager-connection-editor-1.8.18-1.1.x86_64