In the datasheet (revised MAY 2019) are tow different statements.
8.3.5 Shutdown
.... SHDN pins include internal pullup resistors that pull the voltage to V+ (enabling the amplifiers) when the SHDN pins are not connected to a signal.
.....The shutdown pin must either be connected to a valid high or a low voltage or driven, and not left as an open circuit
what is right now?