Ipsec issue after upgrade second pfsense to 2.7.2

[odric]

Good morning.

I have two pfsense environment on site A v. 2.7.2 and site B with v. 2.7.0. They are connected site to site with Ipsec ikev2 and work correctly.

I have not been able to update site B because when updating (From clean install and recovery config.xml) Ipsec phase1 and 2 establish but the traffic from site B to A does not work correctly. Traffic from A to B works fine but from B to A it fails.
Analyzing a capture of ping traffic I have seen that the Packets from network B arrive at end A with a different range, for example 192.168.50.4/23 origin > looks like 192.168.53.4. And I was forced to go back with the VM backup.

This same thing has not happened to me in anothers sites like a Site C v. 2.7.2 connected to A.

I tried disabling both ends on sites A and B, and creating new phases 1 and 2 on both but the same thing happened.

Sorry if it is not understood very well. I have tried to be as clear as possible and no have time to make more captures or test in a producction enviroment.

Thanks.