Found in Version:
T_Mw_TerrRockVM_MtPeakSnow_01, 02 and 03
T_Mw_TerrRockVM_MtRidgeSnow_01, 02 and 03
are referring to correcly named statics in Tamriel Data, with added "s" or "sn" to differentiate them from the non snow versions. But they appear similar in the CS, without snow.
Other VM assets seem to have snow on them as intended. Since it's for the later releases I consider this a minor bug.