WMTS Cesium behaviour on 404 missing tiles


I use a WMTS delivering images at given levels and regions.

Parameters for the wmts are minimumzoomlevel and maximumzoomlevel (i.e minimumTerrainLevel, maximumTerrainLevel if used as ImageryLayer)

Now I have a strange behaviour, that Cesium displays grey tiles, if my wmts delivers a 404 tile not found.

Is there a posibility to ignore the tile not found by Cesium ?

(that the underlaying OSM isdisplayed in a correct way is due to the transparency of the deliverd wmts tiles)


One solution for the gray tiles is:
use rectangle-parameter in ImageryProvider