fix: default option loaddbvalues

Author: maurei

src/JsonApiDotNetCore/Configuration/JsonApiOptions.cs

@@ -48,9 +48,9 @@ public class JsonApiOptions
         /// Whether or not database values should be included by default
         /// for resource hooks. Ignored if EnableResourceHooks is set false.
         /// 
-        /// Defaults to <see langword="true"/>.
+        /// Defaults to <see langword="false"/>.
         /// </summary>
-        public bool LoadDatabaseValues { get; set; } = true;
+        public bool LoadDatabaseValues { get; set; } = false;
 
         /// <summary>
         /// The base URL Namespace

src/JsonApiDotNetCore/Hooks/Execution/HookExecutorHelper.cs

@@ -106,6 +106,8 @@ public HashSet<TEntity> LoadDbValues<TEntity>(IEnumerable<TEntity> entities, Res
 
         bool ShouldLoadDbValues(DependentType entityType, ResourceHook hook)
         {
+            if (hook == ResourceHook.BeforeImplicitUpdateRelationship) return true;
+
             var discovery = GetHookDiscovery(entityType);
 
             if (discovery.DatabaseDiffDisabledHooks.Contains(hook))