The Tuba client for Linux does very well with #snac2
https://tuba.geopjr.dev/
Discussion
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Are custom emojis rendered there? 
I do not know why they don't appear in any API client with my #snac instance. The strange thing is that they work fine on EmojiReact and the emoji selector, but not in the actual posts. They never have. 
@daltux@snac.daltux.net I'll have to take a look