[BUG] Missing data is creating too much blur on the map

[AnthonyGlt]

When MVT data are missing, there is some kind of visual bug happening around the missing parts. It look like it's missing more data than it actually is.

Context

I'm using a MVT covering all France, so outside of France I don't have data. But half is missing in the representation done by iTowns

Steps to Reproduce (for bugs)

I'm using the source from IGN https://data.geopf.fr/annexes/ressources/vectorTiles/styles/PLAN.IGN/standard.json.

datamissing.webm

[AnthonyGlt]

   const mvtSource = new itowns.VectorTilesSource({
                style: 'https://data.geopf.fr/annexes/ressources/vectorTiles/styles/PLAN.IGN/standard.json',
                crs: 'EPSG:3857',

            });

            var mvtLayer = new itowns.ColorLayer('mvtLayer',{
                source: mvtSource,
                addLabelLayer: true,
            });