The concept with the marked chests is very good, but as for the soft lock with the knights, I can't really get it to happen. After defeating the boss, the main exit is on the left. If you came from the right, the gate should be open. And if you came from below, that means you must have roll, and in that case, there shouldn't be a problem. Either something is actually buggy, or I don't understand the problem. Tomorrow I will try to fix the Kółek.