Obviously, I'm not a local, but it's quite clear that the commonly used name is 'spiaggia di Bibione'. The official page of the 'comune' refers to this beach by this name. You can check https://www.comunesanmichele.it/flex/cm/pages/ServeBLOB.php/L/IT/IDPagina/88
It's not something I made up myself from nothing; it has a real use. People search the beach by this name, so don't you think it should be renamed accordingly?