Can’t figure out how to make RouterOS do what swos can do. In swos there is “Independent VLAN Lookup” but RouterOS does not seem to be able to do this. With “Independent VLAN Lookup” enabled in swos you can have the same traffic on on vlan enter through a trunk and also connect to an isolated management port but RouterOS comingles the mac addrs so as soon as you plug the management port into any vlan on a trunk it breaks the trunk and the management port.
I guess you’re talking about “IVL - Independent Learning” … and is the only mode supported by bridge (most switches support also SVL - Shared learning).
But my guess is that this is not your problem, probably it’s RSTP … if you’re connecting two bridges/switches using two physical links. STP and RSTP are not VLAN aware so it doesn’t matter if different physical links are configured to carry different sets of VLANs (MSTP is VLAN aware but not many low-end switches support it). So you’ll have to reconsider your network topology.