Nightingale Legacy Portal
When travelling to the vault from the main Ascended Herbarium realm, my character lost all their inventory (curiously, 3 Eoton Wood that I accidentally spent earlier building something was restored...)
Never mind I am an idiot....
I left the portal vault, and checked the fae chest and my gear was all in there.
... I must have bumped "transfer all" by mistake...
To further clarify, it only impacted my backpack inventory.
"Belt" items in the toolbar were fine, clothes were fine, cards were fine and essence was fine.