BIRD removing BGP routes from other daemon - FreeBSD

Hello, I have a particular scenario where my BGP runs with OpenBGP and I can not change it right now. However I want BIRD to use OSPF and BFD. While BIRD works perfectly, better than OpenOSPF for my scenario, when I start it, it completely removes all routes installed by OpenBGP. My kernel context has learn, persist and import: protocol kernel { learn; persist; scan time 10; import all; #export all; graceful restart on; } What should I do to keep BIRD co-operating with other routing daemons? Thank you.