Fix people deduplication lookup (#14864)

Jellyfin.Server.Implementations/Item/PeopleRepository.cs

@@ -74,6 +74,11 @@ public class PeopleRepository(IDbContextFactory<JellyfinDbContext> dbProvider, I
     /// <inheritdoc />
     public void UpdatePeople(Guid itemId, IReadOnlyList<PersonInfo> people)
     {
+        foreach (var item in people.Where(e => e.Role is null))
+        {
+            item.Role = string.Empty;
+        }
+
         // multiple metadata providers can provide the _same_ person
         people = people.DistinctBy(e => e.Name + "-" + e.Type).ToArray();
         var personKeys = people.Select(e => e.Name + "-" + e.Type).ToArray();
@@ -106,7 +111,7 @@ public class PeopleRepository(IDbContextFactory<JellyfinDbContext> dbProvider, I
         foreach (var person in people)
         {
             var entityPerson = personsEntities.First(e => e.Name == person.Name && e.PersonType == person.Type.ToString());
-            var existingMap = existingMaps.FirstOrDefault(e => e.People.Name == person.Name && e.Role == person.Role);
+            var existingMap = existingMaps.FirstOrDefault(e => e.People.Name == person.Name && e.People.PersonType == person.Type.ToString() && e.Role == person.Role);
             if (existingMap is null)
             {
                 var sortOrder = person.Type == PersonKind.Actor ? (person.SortOrder ?? ++maxSortOrder) : person.SortOrder;