[lxgr]

I think there are some restrictions on tab "navigation source". (Something about a fairly obscure JavaScript feature that links tabs opened via click navigation, if I recall correctly.)

Does this also happen when you type the Twitch URL in a new tab?

[Dylan16807]

Yes. Or even if I have another tab on youtube or whatever and type in twitch, it will close the youtube process and switch to sharing the existing twitch process.