dual wan doesn't work

[bdario]

Hello,
Opnsense rel 24.1-amd64

I configured two wan interfaces and one client interface:

WAN (active gateway)
192.168.1.2/24
gw: 192.168.1.1

WAN2
10.150.48.1/24
gw: 10.150.48.254

my goal is to have the automatic switch between the two wans when the active one falls

I followed this: https://docs.opnsense.org/manual/how-tos/multiwan.html
but when I disconnect the DSL connector from the router of the active connection (WAN) the second connection is not established.

If I manually change the priority of the gateways the connections correctly switch.

Can someone please help me?

Greetings
Dario