“Euphoria” and “Saltburn” actor Jacob Elordi is under investigation by Australian police after allegedly assaulting a radio producer. Elordi, 26, was at a hotel in Sydney on Saturday when he was approached by Joshua Fox, a producer for morning program “The Kyle & Jackie O Show,” according to Australian newspaper Daily Telegraph. On Sunday’s episode of the show, Fox said that he asked Elordi for some bathwater as a gift for one of the radio hosts, a jokey reference to a provocative scene in “Saltburn” featuring an obsessive Barry Keoghan. Elordi purportedly asked Fox to stop filming their inter…