Understanging floating rules

[sirio81]

Hi all, I'm reading documentation and testing floating rules.
The may greatly simplify my tasks!
My pfsense has 2 wan nic(s).
The are configured as gateway group in failover and it works fine.
Then I have 3 nic(s)
LAN  (vlan 1)
LAN4 (vlan 2)
LAN6 (vlan 6)
LAN8 (vlan 8)
I also created a group named AllLan with those nic(s).

I disables the default LAN rule and created a new floating rule with the same paramters:
Action: pass
Quick: checked
Interface: AllLan
Direction: In
Address Family: ipv4
Protocol: any
Source: any
Destination: any
…
Advanced / Gateway: MyGatewayGroup

It works!
I have no other rules on the other LAN interfaces.
So what's wrong?
Usualy to be able to resolve names by pfsense, I had to add a rule.
(On my client, the nameserver is pfsense).
Nontheless, I can access pfsense web interface also from the other LAN networks.
Only LAN interface has the anti lockout rule (not LAN4, LAN6, LAN8).