An episode of the Simpsons in which the cartoon American family visit Tiananmen Square is absent from Disney’s streaming channel in Hong Kong, at a time when authorities are clamping down on dissent. The missing episode adds to concerns that mainland-style censorship is becoming the norm in the international business hub, ensnaring global streaming giants and other major tech companies. The Hong Kong version of Disney+ started streaming this month and customers soon noticed that an episode of the Simpsons featuring China was absent. Episode 12 of season 16, which…