Re: Product Filter Module and Product Specific Attributes
I believe it was implemented intentionally.
Let's say you have 100 products with 2 product-specific attributes each. As Product Filter doesn't know how to group these attributes together, it would have to show a block with 200 options (one for each attribute) - this is definitely something that no one can use ever. Even if you name all the attributes the same (for example, "color"), Product Filter would consider these as different attributes.