WMS Validation unreproducible failed tests

[manilly]

Hi,
I tried to validate our WMS https://inspire.lfrz.gv.at/000502/wms?version=1.3.0&request=GetCapabilities and there are some failed tests I don't understand nor can reproduce it

1. "Test that a legend is provided into LegendURL element for each style and supported language defined in the View Service." --> The Capabilites have a <Style> with reachable endpoint https://inspire.lfrz.gv.at/000502/ows?service=WMS&version=1.3.0&request=GetLegendGraphic&format=image%2Fpng&width=20&height=20&layer=Benachteiligte%20landwirtschaftliche%20Gebiete%20%C3%96sterreich as valid image format
2. http-request-getmap-default-parameters with saved response "https://inspire.lfrz.gv.at/000502/ows?BBOX=9.513187319248825%2C46.24710613018896%2C17.26275837729408%2C49.13206330877627&CRS=CRS%3A84&FORMAT=image%2Fpng&HEIGHT=500&LAYERS=Benachteiligte+landwirtschaftliche+Gebiete+%C3%96sterreich&REQUEST=GetMap&SERVICE=WMS&STYLES=polygon&VERSION=1.3.0&WIDTH=500" is a valid image but "check-content-type" failed?
3. GetMap Transparent Parameter: Saved response is "https://inspire.lfrz.gv.at/000502/ows?BBOX=9.513187319248825%2C46.24710613018896%2C17.26275837729408%2C49.13206330877627&CRS=CRS%3A84&FORMAT=image%2Fpng&HEIGHT=500&LAYERS=Benachteiligte+landwirtschaftliche+Gebiete+%C3%96sterreich&REQUEST=GetMap&SERVICE=WMS&STYLES=polygon&TRANSPARENT=TRUE&VERSION=1.3.0&WIDTH=500" wich is reachable but "check-content-type" failed?
4. GetMap Exceptions: Response "https://inspire.lfrz.gv.at/000502/ows?BBOX=zzzz&CRS=zzzz&FORMAT=zzzz&HEIGHT=zzzz&LAYERS=zzzz&REQUEST=GetMap&SERVICE=WMS&STYLES=zzzz&VERSION=1.3.0&WIDTH=zzzz" returns a exception in xml and "https://inspire.lfrz.gv.at/000502/ows?BBOX=zzzz&CRS=zzzz&FORMAT=zzzz&HEIGHT=zzzz&LAYERS=zzzz&REQUEST=GetMap&SERVICE=WMS&STYLES=zzzz&VERSION=1.3.0&WIDTH=zzzz&EXCEPTIONS=XML" also returns a exception in xml but "check-content-type-xml" failed?

Validation report: WMS.html.txt