[REG 5.6-5.7.0][macOS]: QLineEdit emits annoying sound after pressing return key

I'm trying out the newly released 5.7.0 on Mac but found this weird annoying bug. When I press return on a QLineEdit, it produces a sound! It's getting annoying very quickly on me.

To reproduce, just try any Qt app built with 5.7.0, even the new Qt Creator 4.0.2. Type something in a line edit box and press return key. It beeps. This is a show stopper for me to update my apps with 5.7.0