Well this was already a bug that exists for a long time and I was more looking into the Cemu side than the Pretendo side about it too.
Here's what happens :
When playing online on Cemu, after a few minutes, I get a message on the top left corner : "disconnected to friend list".
When being in a game, like for example Minecraft, I can launch, a world have some friends join and then, suddenly, it disconnects me to my friend list !
My friends stay in the world, see me, everything is fine... well until someone else tries to join : they just don't see me, it says I am offline in the friend list and if someone in the world leaves, he won't be able to join back unless I restart my game, not even restarting the lobby works. And the problem is that it does it a few minutes after I run the game, so I am not even able to stay on for some time to host a Minecraft world for example.
So to clarify the issue :
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After a short time I am seen as offline by my friends in the friend list and everywhere else
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I can only play with people that joined before the disconnection to the friend list
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Not able to host a Minecraft Wii U SMP on cemu which I am forced to do with my real Wii U for more than a year already.
I am not sure on which side this is to fix but I belive it's on both sides to stand together to fix this.