It certainly can, because it doesn't necessarily know where the closing brace should be, especially when inserting as opposed to writing a completely new line. I'm often deleting random crap in the editors I use with the 'feature' as I'm adding delimiters. '"' tends to be even worse, because the distinction between opening and closing is not obvious.

e.g.:

(a + b > c) -> ((a + b > c) -> (()a + b > c) -> no, I was aiming for ((a + b) > c)

(it sound like you're talking about a different feature/implementation, though, since in the annoying case there's no 'completion' shortcut, it just appears)