I’ve tried ALL solutions I thought but actually, this one worked first try…How people come up with this I have no idea!
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make sure your game is in windowed or borderless window
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set the minimum background fps to 1fps
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relog outside of the cave
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click on the cave entry and tab out, and wait until everything has fully loaded at 1fps
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start the conversation and tab out again
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wait until they start shouting, then you’re safe to continue normally with the quest