Had an issue with Ethel incorrectly identifying my character, presumably referring to Gale. Elf female wizard being identified as a Human male wizard.
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I did not complete the deal with Ethel, but going back to sneak attack one of the goblins in the town results in Ethel going hostile in my log. I stole some items from her hut with Astarion sneaking around inside.
Edit 3: Any combat, anywhere, appears to trigger this.