[osgeo4w-dev] [osgeo4w] #780: QGIS 3.30.0-1: sagaprovider plugin deprecation causes "Invalid plugin" in plugin manager

[OSGeo4W]

#780: QGIS 3.30.0-1: sagaprovider plugin deprecation causes "Invalid plugin" in
plugin manager
--------------------+---------------------------------------------
Reporter:  houska1  |      Owner:  osgeo4w-dev@…
    Type:  defect   |     Status:  new
Priority:  normal   |  Component:  Package
 Version:           |   Keywords:  qgis sagaprovider pluginmanager
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 Upgrade of QGIS to 3.30 in OSGeo4W leaves the following inscrutable error
 message for invalid core plugin sagaprovider when the plugin manager is
 invoked: [https://user-images.githubusercontent.com/48919900/223901624
 -20043edf-a8ce-4e54-9931-49a8781199c9.png Screenshot]

 The (old) SAGA provider has been removed from QGIS sometime in Nov 2022. I
 believe the issue is that while it is no longer installed in a clean
 install, it remains present if an upgrade is made over top of a pre-
 removal version. Functionality does not seem to be impaired, but the error
 message is incomprehensible to users due to the red herring about metadata
 being missing and the warning that as it is a core plugin it cannot be
 uninstalled.

 I originally made this issue report as
 [https://github.com/qgis/QGIS/issues/52160 a QGIS ticket] but was
 redirected here.
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Ticket URL: <https://trac.osgeo.org/osgeo4w/ticket/780>
OSGeo4W <http://trac.osgeo.org/osgeo4w>
OSGeo4W is the Windows installer and package environment for the OSGeo stack.