(Painter/Designer 2020) Error importing .SBSAR from designer to painter

I made a procedural material/filter on designer, and i noticed that some time in the process painter just straight up refuses to import the .SBSAR file anymore, i already scrapped the whole shader and started over, it was working fine and suddenly it breaks when i import to painter and all i get is an error ([EngineProcedural] Failed to decode substance) and an empty asset that doesn't do anything.

This thing is driving me insane, i've been trying everything i could, there's zero information about any of this in the entire web and no matter what i do, i just can't get it to work anymore.
Im linking in the .SBS and .SBSAR files, if anyone could help me out here i'd be forever thankful.