necro bump
Random oddity. There is a website that lists the probabilities for each chest type for every specific drop (http://gow.mengmeizi.com/Calculator). And for some reason Gem Chests currently show 70 Ultra-Rare instead of 71, so I went through the list and found that Wayfinder isn’t listed. But it is listed in the glory chests.
So either the website has an issue (which seems unlikely as it appears to pull data out of the game files and isn’t human entry), or somehow Wayfinder was never added to gem chests. When I did a search, this post came up which reinforces my assumption.