Bug in RouterOS 3.X rc.X...

Hello everybody.
I found a bug in this release 3.X… all release candidates that i try.
The bug is in the IP - > Routes
I have 30 real IP static address 84.xxx.xxx.xxx. This IP addresses comes to me in the VLAN 212.xxx.xxx.xxx.
Now, I must to goes out from the router from one of this 30 address.
When I input prefer sources to be one of this 10 addresses nothing works.
I goes up from address of the VLAN witch is 212.xxx.xxx.xxx
My 30 addresses is 84.xxx.xxx.xxx.
I route all my network trough prefer address 84.xxx.xxx.xxx, but this doesn’t work. :frowning:

With stable version 2.9.xx that works perfect :confused:
Can anybody help to me, or this is a BUG in this release???