I verified that if taking a screenshot under Jolla, the screen is really in portrait mode. The resulting image comes in portrait. Does any one have a clue about what might be the problem?

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Doing some quick tests I saw that this error is printed in log whenever I change the device orientation:
Dec 14 15:17:40 localhost [467]: [W] unknown:20 - qrc:/qml/SystemWindow.qml:20: ReferenceError: initialSize is not defined
Dec 14 15:17:40 localhost [467]: [W] unknown:21 - qrc:/qml/SystemWindow.qml:21: ReferenceError: initialSize is not defined
Dec 14 15:17:42 localhost [467]: [W] unknown:20 - qrc:/qml/SystemWindow.qml:20: ReferenceError: initialSize is not defined
Dec 14 15:17:42 localhost [467]: [W] unknown:21 - qrc:/qml/SystemWindow.qml:21: ReferenceError: initialSize is not defined

Process 467 is:
nemo 467 1.5 7.7 221760 78920 ? Ssl 14:11 1:03 /usr/bin/lipstick --systemd