Layer-2 VPN with VxLAN over IPsec not work

https://kb.fortinet.com/kb/viewContent.do?externalId=FD40170&sliceId=1 - the settings are made according to this manual. On one A-fortigate a vlan comes to the port, on the other side a B-fortigate with a regular port, where the traffic is untagged.

Why do I see the mac-address of the host network B on the VxLan-IPsec-interface, and not on the port3? It seems to me that it does not work precisely because of this.

Expectation:

Real [size="2"](00:50:56:01:05:32 - local_host[not_ok], 00:50:56:97:b5:05 - remote_host[ok])[/size]: