When a search is started from the filter "productClusterIds", applying any additional filter will convert it to "productClusterNames", losing the characteristic of presenting the items with the sorting manually defined at the product collection.

The scenario can be seen on any page, like "store.com/111?map=productClusterIds", and applying any additional filter, like a category, specification, etc.

The user will be directed to "store.com/clothing/special-sale?initialMap=productClusterIds&initialQuery=111&map=category,productclusternames".

There's no workaround for the specific issue if you need the special sorting, but be sure to use "productClusterIds" only in required scenarios. Otherwise, use the filter as "productClusterNames".