yeah it wasn’t fixed in UE5.6 and also new issue/remain issue - some maps with text3d used in characters now not opening
small tipo for cases like yours, you can change default loading map on something else, to run project
// DefaultEngine.ini
[/Script/EngineSettings.GameMapsSettings]
GameDefaultMap=/Game/TEST/Maps/L_StartScreen.L_StartScreen
EditorStartupMap=/Game/TEST/Maps/L_StartProjectMap.L_StartProjectMap