The referenced schema xmlns:ogc="http://www.opengis.net/ogc/1.1" does not really exist.

One of the WSDL for WFS 2.0 file, namely wfs-xml-insterfaces.wsdl, in its section declares as follows:

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However, the namespace "http://www.opengis.net/ogc/1.1" does not exist anywhere in the world. Neither in any other xsd or wsdl file in OGC resources, nor in any of the google responses. Is this declaration really correct, or am I missing something?

Start by inspecting wfs-xml-insterfaces.wsdl and its declaration, then follow the included wfs.xsd and compare the ogc namespace with the OGC schema and WSDL resources referenced in the issue. Done means establishing whether the namespace is valid and, if not, identifying the correct declaration and documenting or correcting the affected schema reference.

Written by the indexing model from the issue text.