diff --git a/ImperatorToCK3/CK3/Characters/CharactersLoader.cs b/ImperatorToCK3/CK3/Characters/CharactersLoader.cs
index bc3af715b..703c48df5 100644
--- a/ImperatorToCK3/CK3/Characters/CharactersLoader.cs
+++ b/ImperatorToCK3/CK3/Characters/CharactersLoader.cs
@@ -30,7 +30,9 @@ public void LoadCK3Characters(ModFilesystem ck3ModFS, Date bookmarkDate) {
 		string[] irrelevantEffects = ["set_relation_rival", "set_relation_potential_rival", "set_relation_nemesis",
 			"set_relation_lover", "set_relation_soulmate",
 			"set_relation_friend", "set_relation_potential_friend", "set_relation_best_friend",
-			"set_relation_ward", "set_relation_mentor",];
+			"set_relation_ward", "set_relation_mentor",
+			"add_opinion",
+		];
 
 		foreach (var character in loadedCharacters) {
 			// Remove post-bookmark history except for births and deaths.
diff --git a/ImperatorToCK3/CK3/Dynasties/DynastyCollection.cs b/ImperatorToCK3/CK3/Dynasties/DynastyCollection.cs
index 2ba25c4b7..59f91d6a2 100644
--- a/ImperatorToCK3/CK3/Dynasties/DynastyCollection.cs
+++ b/ImperatorToCK3/CK3/Dynasties/DynastyCollection.cs
@@ -146,14 +146,15 @@ public void FlattenDynastiesWithNoFounders(CharacterCollection characters, House
 				continue;
 			}
 			
-			var dynastyHouses = houses.Where(h => h.DynastyId == dynasty.Id).ToArray();
-			List<Character> cadetHouseMembers = [];
-			foreach (var house in dynastyHouses) {
-				var houseMembers = characters.Where(c => c.GetDynastyHouseId(date) == house.Id);
-				cadetHouseMembers.AddRange(houseMembers);
-			}
+			var dynastyHouseIds = houses
+				.Where(h => h.DynastyId == dynasty.Id)
+				.Select(h => h.Id)
+				.ToArray();
+			var cadetHouseMembers = characters
+				.Where(c => dynastyHouseIds.Contains(c.GetDynastyHouseId(date)))
+				.ToArray();
 			
-			if (cadetHouseMembers.Count == 0) {
+			if (cadetHouseMembers.Length == 0) {
 				continue;
 			}
 			
@@ -163,8 +164,8 @@ public void FlattenDynastiesWithNoFounders(CharacterCollection characters, House
 			}
 			
 			// Remove all the cadet houses.
-			foreach (var house in dynastyHouses) {
-				houses.Remove(house.Id);
+			foreach (var houseId in dynastyHouseIds) {
+				houses.Remove(houseId);
 			}
 			
 			++count;