If any Diablo 4 players run into this problem, their best bet is to open the map, click on the dungeon's entrance, and choose to leave. They should then be able to re-enter the dungeon and complete it like normal, barring any other unforeseen issues. This isn't totally ideal as it means walking back through the dungeon, some of which can be fairly large, but it's better than completely losing one's progress. This fix will have to do until Blizzard issues a Diablo 4 update that addresses the root of the problem.
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