It looks like this quest can bug out on different stages. Mine bugged out after following trail (i have grey “follow Rox trail”) and abandoning story dont reset my progress.
Devs are aware of this issue and working on a fix
(post by Matthew Medina)
https://forum-en.gw2archive.eu/forum/game/hot/Change-to-HoT-Story-Gating/page/3#post5657865
I also encountered that problem.
I got my chest from Tarir forgotten city event in Auric Basin. Also i did that event twice, got two chests, and both of them causes my client to crash.
Other green chests (as in from other events, other zones) don’t cause such issues.
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