Passing IPsec networks through SSL VPN

Dear,

I have a site-to-site VPN between a Sophos XGS87 and a fortigate.
I need SSL VPN users on my Sophos to have access to remote networks from this fortigate.

Local networks on the Sophos XGS87 side:
10.40.85.0/24
10.50.85.0/24

Sophos SSL VPN Network:
10.81.234.0/24

Before publishing the Sophos SSL VPN network to this IPsec, traffic flows normally:

But after publishing the Sophos SSL VPN network to this IPsec, the networks stop communicating:

Does anyone have any idea what could be happening and what I can do to resolve it?