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Thank you .
net/frr: Multiple BGP peers causes config generation error #2623
It seems to be a my case. And now I know where to look for errors like that.

Something broke in os-frr in 21.7 for me.  FRR by itself works fine, but no changes can be done to FRR config via GUI.  If I start from new install and restore config from backup /usr/local/etc/frr/*.conf are not getting populated and FRR process can't start.

I guessing that something is proceeding templates from /usr/local/opnsense/service/templates/OPNsense/Quagga/
is failing.  But what is it and how to troubleshot it? I fail to find any documentation regarding internal working of os-frr and really do not want to start digging through the code. 

Could someone point me to right direction?

BTW: config works fine with 21.1

Are you NAT ing to DMZ interface IP?  Packet capture suggests that you are not. What is 192.168.10.103?