Fortigate aggregate fortilink + MCLAG FortiSwitchA and FortiSwitchB

Hello,

I followed this KB  https://docs.fortinet.com/document/fortiswitch/7.0.8/devices-managed-by-fortios/801194/deploying-mclag-topologies.

This is my topology:

Aggregate FGT (x1,x2) set lacp-mode active and Fortilink split interface disable.

FGT x1 --> port23 FortiSwitchA

FGT x2 --> port23 FortiSwitchB

port 24 FortiSwitchA --> port 24 FortiSwitchB

port 25 FortiSwitchA --> port 25 FortiSwitchB

This is the topology

but I would have expected a topology like that

Any suggestions? 

Thanks in advance for the support.

BR