Merge pull request #12908 from scampower3/search-for-missing-overrides-existing

Fix search for missing metadata overriding existing metadata

MediaBrowser.Providers/Manager/MetadataService.cs

@@ -817,7 +817,9 @@ namespace MediaBrowser.Providers.Manager
                     }
                     else
                     {
-                        var shouldReplace = options.MetadataRefreshMode > MetadataRefreshMode.ValidationOnly || options.ReplaceAllMetadata;
+                        var shouldReplace = (options.MetadataRefreshMode > MetadataRefreshMode.ValidationOnly && options.ReplaceAllMetadata)
+                            // Case for Scan for new and updated files
+                            || (options.MetadataRefreshMode == MetadataRefreshMode.Default && !options.ReplaceAllMetadata);
                         MergeData(temp, metadata, item.LockedFields, shouldReplace, true);
                     }
                 }