I’m not sure how common this is but I just encountered this bug relating to Millie’s name when talking to Surya. I hope it’s visible enough from the picture, but the text shows her name as <NPCName>Millie</>. I’m on Spring 10 year 4, occurred on the path directly under the vineyard at around 9:40am.
I’m on steam, Xbox controller, v1.2-1238. I’m not able to grab the save file right now but please let me know if it’s needed!