I can't seem to get seasonal grass lods to function in 1.6.353.
I created an MO2 clone instance, downgraded it to 1.5.97, installed NGiO, set the required settings in the relevant INI, and generated grass cache for each season. I then batch renamed them appropriately (from *.cgid to *.<season identifier>.gid), put them all in one mod and transfered it over to the 1.6.353 instance. So far, so good. I then attempted to create Grass LOD with DynDOLOD advanced mode, made sure that Grass LOD mode was set to 1, made sure that the grass references were being read and let DynDOLOD do its thing. And no grass LODs were generated, because Tamriel finished in 10 minutes.