Driver clears status register, before exception callback is called

I set receive FIFO depth to 1 in Config_netX.c, and when I sent one break signal from PC, the UART exception callback handler was invoked, but I didn't see the break error bit was set in status register.

What I am expected is, I set receive FIFO depth to 1, and when one break signal was received, I shall be able to detect it by reading the UART status register.