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When choosing Catalyst, it shows Chitinoid Belt of Aurora transforms to Tireless Collector’s First Kill of the Aurora. However the Tireless Collectors belt popup has FOUR secondary stats, Crit+Haste+Mastery+Versa instead of two (Crit+Mastery as shown in game), so seems like it’s overweighting this as it shows a 2% increase at 645.
Thanks for the report – we’ll fix that in an update probably later today.
Just to confirm: that item is actually eligible to be converted for you at the catalyst? We changed how we were detecting that to pick up some items that we were not previously.
We just posted an update that should resolve this – some of the bonus IDs that added random suffixes to the source item were not being removed when converting to catalyst items. If you re-run your upgrade finder search it should update the results.
I am sorry but now in the grat vault i dont even have the “catalyst” item anymore 
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The legs should be elligeable for catalyst right ?
I suppose it is linked to this “fixe” because it wasn’t the case yesterday.
Right… I’ll have to take a look at that, I wonder if the in-game API call won’t work for determining if a great vault drop can be converted in the catalyst… I think the item actually has to be somewhere in your inventory for the call to even function…
Though my guess is that most (all?) great vault rewards can be converted (for the appropriate slots).
The issue with catalyst option on the great vault search should be fixed now – yeah the API call in-game to determine if an item can be converted is – in good blizzard fashion – coupled to the UI in an irritating way such that it is not a generally usable function, so for that search I reverted to the old approach of determining if the item can be converted.