pfSense blocks clients on LAN connected via wifi router in AP mode

Hello,

I would need a help with the following situation please:

Our LAN (192.168.1.x) is connected to internet through pfSense firewall with Squid Proxy Server, so all users have to have set up connection via proxy otherwise they can't reach internet. Now I need to add to our network wifi router. If the router is in "router" mode so DHCP is on (connected devices are on different subnet, e.g. 192.168.0.x) there is no problem, everything is working. But as soon as I configure router as AP (because I need all connected device on the same subnet, i.e. 192.168.1.x), no device can't reach internet via wifi. Strange is that PCs connecetd to wifi router via ethernet cable can reach internet without any problem. So problem is only with wifi connection.

I checked "ipconfig /all" command on both working (LAN) and not working (wifi) devices and they...