Rooted Mobile Phone connected to a Wifi, it's usb tethered to a PC, how can i host a public minecraft java server in this PC? is it even possible?

In my wifi router, the phone’s internal IP is 192.168.0.152. I am hosting through port 6666 so i port-forwarded port 6666 to the host 192.168.0.152 in my wifi router.

In my phone, connected with adb shell, ifconfig

wlan0     Link encap:Ethernet  HWaddr 64:CC:2E:27:1B:90
          inet addr:192.168.0.152  Bcast:192.168.0.255  Mask:255.255.255.0 

rndis0    Link encap:Ethernet  HWaddr 06:8D:91:A9:95:3C
          inet addr:192.168.42.129  Bcast:192.168.42.255  Mask:255.255.255.0 

In my PC (Ubuntu 20.04), ifconfig

usb0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.42.146  netmask 255.255.255.0  broadcast 192.168.42.255

Minecraft’s server.properties, only two entries were edited, others are kept default

query.port=6666
server-port=6666

I tried the rooted solution provided in this answer
https://android.stackexchange.com/a/207342 which uses iptables

For my case i typed:

echo 1 >/proc/sys/net/ipv4/ip_forward

iptables -t nat -I PREROUTING -p tcp --dport 6666 -j DNAT --to 192.168.42.146
iptables -I FORWARD -p tcp -d 192.168.42.146 --dport 6666 -j ACCEPT

Finally i ran the server on my PC, and i was only able to connect to it via 192.168.42.146:6666

{PUBLIC_IP}:6666 was unable to connect and the error are like the following

Thanks for helping!