Basically, it is automatically capitalizing the word after a ! or ? in quotes, even when it is the dialogue tag. It is very adamant about the correction to the point that I ended up sticking a comment on it when I got tired of fighting the change.
Reproduction steps:
Type a line of dialogue:
"George, get the car!" he said.
The "He" should be lowercase because the ! is not end punctuation but rather internal punctuation. This will not always be the case, but automatically correcting it will create many errors when writers are more likely to remember to capitalize the first word of a new sentence.
Thanks
