Bungie has said that Three of Coins is working as intended in most contexts, following concerns that Xur's new consumable may be bugged.
The developer did say though that in some instances ToC, which is meant to increase players' chances of obtaining exotic drops, was not working properly, and a patch would be issued in early 2018 to address this.
Part of the problem with ToC was that players didn't understand exactly how it worked, other than it increased the chance of an exotic drop for four hours, so it was hard to judge whether it was broken or just stingy. It turns out it's mostly the latter.
"When players use a Three of Coins consumable, this provides a 50% increase to the base chance of being rewarded an Exotic Engram upon activity completion," Bungie wrote on its forum.
"Using this consumable does not guarantee an Exotic reward upon completing a set number of activities – but rather increased chances upon each activity completion."
In other words, if you've used a lot of ToC and haven't got many (any?) exotics, then that may just be poor RNG. There was one exception, however.
"Note: We have found that Heroic Strikes do not currently grant higher chances for Exotics when using Three of Coins consumables, compared to Vanguard Strikes. We’re looking to address this with a future Hotfix, expected in early 2018."
As you can imagine, this explanation didn't go down well with fans - especially the part about a hotfix not coming until 2018 - as many are still enraged by recent issues around content access and the rate XP is earned.
Playing devil's advocate for a second, though, we seem to remember Three of Coins was far from a guaranteed exotic in Destiny 1, so perhaps the fury around this is a little overblown.
Elsewhere, Bungie also said it was looking into issues with Fated Engrams, which were also added to Xur's inventory in Destiny 2 last Friday.
We are investigating reports that some players have received duplicate Exotic rewards from Fated Engrams. More information will be provided once available.— Bungie Help (@BungieHelp) December 18, 2017
It feels as though everyone connected with Destiny 2 - players and developers - can't catch a break at the moment. Hopefully The Dawning will help tempers cool over the holidays.