Issues when logging category name is logging type name

When the logging category name is a logging type name (debug, warning, info, critical), enabling logging isn't always straightforward.

An example from Qt itself is qt.scenegraph.info. It exhibits the following behavior:

No output:

QT_LOGGING_RULES="qt.scenegraph.info=true"

Correct output:

QT_LOGGING_RULES="qt.scenegraph.info.debug=true"

I would have expected the first formulation to produce output as well.

Alternatively, the behavior could be documented, and qt.scenegraph.info could be updated.