Well, I found out why. The latest PyQt5 is broken with sip4 and our package was just out of date. Also, sip6 exists nowadays... Lastly, the Python bindings are actually unmaintained in #KDE and considered "black magic" so I don't count on it existing for long.
Conclusion: I'll be dropping it again from our repos and also update our PyQt5 and sip. Too bad, I was really exicted about these bindings 😢
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