It removed “Upgraded” stats like Speed.
Are you talking about the Creation Catalyst? That would make sense if you are since your converting one piece of gear to a completely different piece of gear.
Kinda like how Transmog is on the gear itself and if you change gear you have to re-transmog.
Looks like it’s already been reported in the Bug Reports section. Just did a quick search for Creation Catalyst and found it on the first two results:
I received High Speed Gauntlets from a mythic plus today and used the Creation Catalyst to turn them into tier since they had speed on them, but it removed the speed stat once they converted into tier. Due to the nature of the Speed stat on the High Speed Gauntlets from Mechagon I’m not sure if this is a bug, oversight, or intended, but it does run counter to the expectation of tertiary stats interaction with the Creation Catalyst from the last tier.
it looks like the creation catalyst is removing tertiary stats.
I had a pair of gloves with speed, I turned them into tier, the speed went away.
I gained a second set of gloves with speed and knowing the issue before I went to the catalyst and put them in to see if it was a 1 time thing. The indication of the item to be the result shows no speed either.
oddly, this doesn’t seem to be hitting sockets.