Description of problem:

Since the last update in Mageia 9
plasma-dicover crashes when trying to list updates to install
(its icon appears meaning that there are updates... but when clicking on it, discover starts and crashes when looking for updates)

Here's what happens when launched from a console :

[philippe@localhost ~]$ plasma-discover
adding empty sources model QStandardItemModel(0xea8650)
file:///usr/lib64/qt5/qml/org/kde/kirigami.2/BasicListItem.qml:288:18: QML QQuickItem*: Binding loop detected for property "implicitWidth"

** (process:1158965): WARNING **: 16:43:19.335: '' is not a valid XDG category name, search results might be invalid or empty.

** (process:1158965): WARNING **: 16:43:19.338: '\xc0\xdb$\u0011C\u007f' is not a valid XDG category name, search results might be invalid or empty.
no component found for "org.mageia.mageia"
packagekitqt.transaction: Unknown Transaction property: "Sender" QVariant(QString, ":1.325")
plasma-discover: symbol lookup error: /usr/lib64/qt5/plugins/discover/flatpak-backend.so: undefined symbol: _ZNK9AppStream4Pool20componentsByBundleIdENS_6Bundle4KindERK7QStringb

NB
Before the update Discover worked perfectly (I use it to update flatpak stuff)