VRT warping method causing spatial inconsistencies.

[ChocopieKewpie]

Warping raster instead of raster points will cause slight shifts in indexed data.
Recommended to warp points instead of the input raster.

[ChocopieKewpie]

Also raster resampling should default to bilinear as per findings:
Li, Mingke & Mcgrath, Heather & Stefanakis, Emmanuel. (2021). Integration of heterogeneous terrain data into Discrete Global Grid Systems. Cartography and Geographic Information Science. 48. 10.1080/15230406.2021.1966648.