Hi! I have RB750 with 5.21 and i have pptp connection like this:

remote offce: RB750
local subnet 192.168.88.0/24
wan 2.2.2.2
tunnel ip 192.168.0.57

local office:
local subnet 192.168.0.0/24
wan 1.1.1.1

Connection from 192.168.88.0 to 192.168.0.0 over tunnel working, but if i reboot device it's not work, because new connection set Reply Dst address - 2.2.2.2, but need ip is 192.168.0.57. If i manually close connection, new connection will be works fine and Reply Dst address - 192.168.0.57
Connection - udp sip 5060.
PS: sorry for my english.