Hi Andrea,
I now also found the bug, and am deploying a fix.
At the same time, I found also a minimal fix as workaround. Specifying the DEM band in load_collection of COPERNICUS_30:
bands=["DEM"]
This avoids that it tries to filter on the NDVI band…
Will let you know when the fix is ready. Note that to improve performance and reduce complexity, you should be able to drop quite a few of those ‘resample_cube_spatial’ calls.