RSRP-222693: Unresolved identifiers in Linq prevent quickfix that inserts "using System.Linq" from working

Unresolved symbols in where clause prevent the quick fix that adds "using System.Linq;" from working.
When you do not have "using System.Linq;" in the following code you get a suggestion to import System.Linq over the group keyword. However, the quick fix always fails. If you remove the where clause that contains unresolved identifier it starts working.

// "resolving" is a resolving identifier of correct type
// "unresolved" is an unresolved identifier
from row in resolving
                            where unresolved
                            group row by row.Field<string>(0) into row2
                            select new { ColumnName = row2.Key }