Multiple specifications with the same name are grouped into the same "facet" by the Intelligent Search, which can be problematic if they have different settings.

Some attributes that may be affected are the filter, hidden and indexed/searchable toggles, field type, and value position. There's no difference between being a product or SKU specification.

It is not possible to know which property will take precedence over the other.

For a store with:

• a specification named "type" (ID 1) set as a filter (to appear in the storefront);
• another specification named "type" (but ID 2), which is not set as a filter (to stay hidden from the storefront).

The storefront may or may not render the search filter for the facet/specification "type" due to the conflict with the "isFilter" property.

Although the Catalog module does not block repeated specification names, this usage should be considered wrong.