guest bridge problem

Hi to all.
I have a problem with my Proxmox server. I installed mikrotik routeros as VM and configured my network. All works perfect, but when I add bridge on my RouterOS and link it with my ethernet adapter, my network stucks on this VM.
I installed RouterOS on this computer physically and nothing went wrong with bridge. So I supposed, that it is a problem with Proxmox. How can I solve this?