@viragomann Yes, actually, I made Allow any to any rules for all interface including bridge interfaces for testing. I wanted to see traffics going right direction and compare what I expected.
However, after I provides IP address to bridge, I'm getting less information from firewall.
From the firewall state, (PC-B to PC-A)
[Any 10.10.40.4 -> 10.10.30.3 SYN_SENT:ESTABLISH]
BRG2 10.10.40.4 -> 10.10.30.3 SYN_SENT:ESTABLISH
BRG1 10.10.40.4 -> 10.10.30.3 SYN_SENT:ESTABLISH
However, I found two solutions.
Creating rules in floating tab with enabling quick
Make BRG1, BRG2 as a one interface group and creating rule.
I have no idea why those can be the solutions but seems like there's something related rule priority.
Thank you for taking care of my issue.