The second and the fifth rune in kingsfall seems bugged. Every time we get one of these symbols, we chest will not spawn. 1, 3, 4, 6, 7,8 and 9 works as intended.
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We did it perfectly last night, got to Oryx, hit the last symbol, we got the notification that we'd done it correctly, then cleared the encounter without wiping. Still no chest! Bungie are aware.