seem no to store AT+UART_DEF with ESP32-AT

[futoshi]

I installed ESP32-AT firmware to my WROOM32, and I tried to change default UART setting but it seems not working.

AT+GMR
AT version:0.10.0.0(Mar 16 2017 19:02:43)
SDK version:v2.0
compile time:Apr 17 2017 16:26:26
OK
AT+UART_DEF=9600,8,1,0,0

OK

UART baudrate immediately falls down to 9600, however it recover 115200 when I restart WROOM32 with AT+RST or power cycle.
Thanks!