MacBook Messages notifications say 'Maybe' in front of known contact names, and Messages also removes contact profile pictures, asking to update to a new picture.
On my MacBook Air M1, whenever I receive a text from someone (in my contacts), I get a notification; however, the notification says 'Maybe' in front of the contact's name. When I go into Messages to reply to the text, the name of the contact is normal and does not have the 'Maybe'. Thus, only the notification does this.
Additionally, when in the Messages app, I will often see a button at the top below the person I'm texting's contact, that I should update their contact picture. After I press this, it removes their actual contact picture which is the one that is in my contacts. After a while, it returns to the original, correct picture and then prompts me to do the same again, repeating the cycle.
MacBook Air (2020 or later)