@rVlad 

I have had the same issues with Panasonic and Toshiba TVs a few times now.  I do think it's a flaw in the TV's firmware / WiFi card as it appears the devices themselves do not like mesh networks, had the same issue on Deco and Eero Mesh Nodes.    Both times it was the same as you are experiencing, it like the master node but no other!  

In the end, I found cabling it (LAN Cable) into the 2nd or 3rd node worked for both Deco and Amazon Eero, however, it is not the ideal result.   Sadly after a few examples of this, I could only determine it to be the TVs themselves and not the Mesh; everything else worked perfectly

@Philbert Thank you for confirming this isn't a remote case. I just bought a Roku Streaming Stick+ to see if it has the same problem. Sadly it does.

@rVlad 

I got one of the TVs working for a customer by switching off the node in that room, moving the main router into the same room as the TV to temporarily connecting it to the mesh. 

Then moved the main node it back to where it belongs and turned on the node in the TV room, TV reconnected (after some time).  Never heard from the customer if it worked long term or not  :(