Today it happened to me too. First time I see that in this game. I was at 88% progression, and got to the next map. Moved and killed a couple of elite packs and the guardian spawned in the previous map. I am certain that there was a clone left in the former map probably still fighting, but there was no way for me to see what it was doing. So TinneOnnMuin is probably right. 12% of missing progression was significant and didn’t felt like a lag or a delayed death.
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