Devices at the lower layer of the router can directly access devices at the upper layer of the router

Two wireless routers are connected to a switch, and the network segment of the switch is 192.168.0.x.
The network segment of router 1 is 192.168.1.x, and the network segment of router 2 is 192.168.2.x.
Then the devices under Router 1 and Router 2 can access the devices under the switch (that is, the 192.168.0.x network segment).
The devices under the switch cannot access the devices under router 1 and router 2.

For example, a windows host 192.168.2.66 under router 2 can directly connect to a Linux server 192.168.0.77 under the switch through ssh.

The windows host can ping the Linux server (that is, the 192.168.2.66 machine can ping 192.168.0.77)

But the Windows host cannot be pinged on the Linux server (that is, the 192.168.0.77 machine cannot ping 192.168.2.66)