3D Tile Water Masks - not functional yet?

Hi there!

Just seeing if anyone else has run into the same issue (or if I’ve missed something!)
Cesium Water Masks work on the Cesium World Terrian, however not on the new Google 3D Tiles (despite there being Water Mask options for both).

‘Enable Water Mask’ is selected for both Terrian sets, however only the ‘flat’ CesiumWorldTerrian tiles display the water mask.

When you hover over that property, it says “Currently only applicable for quantized-mesh tilesets that support the water mask extension.” The Google tiles are not quantized-mesh, nor do they contain water mask information.