Similar to BonnChan, but caught early in NPC Memories before it makes its way into dialog.
So, I started a new game and talked to Oriana for a little bit, talked to Celandine and Oriana together for a very short conversation. I looked into the NPC Memories and Celandine had a ridiculously long memory in her "ThingsThatHappened" section of the overheard conversation between Oriana and Player Character. Literally 427 words long/510 tokens of her just repeating the same thing over and over again, from simply overhearing a conversation before I've even talked to the NPC.
Happened on Gemma 4 sparse, locally, on Windows.