I took a minion out of my vault, had it in my inventory. Clicked on said minion, got the spiffy new menu, and clicked the link to put the minion in my pet Erelin's treasure. So far, so good. But apparently something happened after this point, because the next page (back to the inventory, I think?) took so long to load that it timed out, and I got the 504 error.

Refreshed the page, and got an error message saying, "Oh no! You don't have this item!" I checked Erelin's treasure chest - the minion wasn't there. Went back to inventory - also not there.

I don't want to file a ticket to get the minion back, as it was one of the cheapest ones (Muse) and I don't want to waste staff's time on that. I've already bought another and put it in the treasure chest with no further issues. But I thought y'all might want to know about the disappearing item thing. Don't want it to happen to someone with a more expensive or rare item. I'm using Firefox 68.0.2 on a Windows 10 laptop, any other details you need just ask and I'll answer to the best of my ability.

Thanks for your time! :)