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mixed format missing mimetype
I think, that the mixed format should have mime_type forced to image/jpgpng
Mapserver, Geoserver and GeoWebCache are using image/vnd.jpeg-png
https://mapserver.gis.umn.edu/ja/mapfile/outputformat.html
https://docs.geoserver.org/latest/en/user/services/wms/outputformats.html
Whatever will work
https://github.com/qgis/QGIS/blob/master/src/providers/wms/qgswmsprovider.cpp#L3693
Then I would go for image/vnd.jpeg-png as a common OSGeo variant.
+1 for image/vnd.jpeg-png