Hi,

 I've added my mobile to isolated devices.

And cannot access wireless connected pc\chromecast\ipcams..... its OK

But isolated device can access wired clients like nas, dvr, my server and some ip cams.

Device isolation is not working properly?

Please dont recommend me to use AP Isolation because home users dont need it

IoT network dont isolate devices, it clients have full access to network so i dont understand why tplink add it?  this is just another wifi.

Question is about Device isolation, I just want to isolate some iot devices from my network

The only solution i found is connecting iot devices to Guest network 

disable Allow guests to see each other
disable Allow guests to access your local network