SINGAPORE/SHANGHAI—China’s Evergrande Group has left global investors guessing over whether it will make a key interest payment, adding to fears that Beijing will let overseas bondholders swallow large losses as a liquidity crisis deepens for the world’s most indebted property company. Evergrande owes $305 billion, has run short of cash, and investors are worried a collapse could pose systemic risks to the Chinese regime’s financial system and reverberate around the world. A Thursday deadline for paying $83.5 million in interest on a dollar bond passed without remark from Evergrande. The firm has a 30-day grace period and will default if that passes without payment. Evergrande’s behavior on the dollar bond interest payment and another $47.5 million payment due next week contrasts with its treatment of its domestic investors. The company this week resolved one coupon payment on a domestic bond. “This is part of the tactics of any sovereign driven …