Bug#1026247: Spyder shows a popup message on start: "You have missing dependencies! Mandatory: qdarkstyle"

[local10]

Package: spyder                        
Version: 5.3.3+dfsg-3


Every time I start Spyder the following popup shows up:

    You have missing dependencies!

    # Mandatory:
    qdarkstyle >=3.0.2;<3.1.0 : 3.1 (NOK)

    Please install them to avoid this message.

    Note: Spyder could work without some of these dependencies, however to have a smooth experience when using Spyder we strongly recommend you to install all the listed missing dependencies.


Other than this message the Spyder IDE seems to functions without issues.

Where do I get that qdarkstyle package?

# aptitude search qdarkstyle
i A python3-qdarkstyle


Regards,