WMTS layers added from for example Geoserver in certain coordinate systems (e.g. EPSG:3879) require the xy-axis to be swapped in order for them to work. My idea is to add a button or a checkbox for swapping the xy-axis so that we can use a WMTS-layer in a coordinate system best suitable for our use.
(In comparison QGIS has checkboxes for swapping or ignoring xy-axis)