Diablo 4's Horadric Cube has a new Mythic trick in Season 15 that players did not know about
There is a way to reroll unwanted Crafted Mythics and remove the Crafted tag.
The Horadric Cube definitely holds a lot of secrets this season, and another one was just discovered. This one could be really good if you ended up with more Crafted Mythics than you know what to do with.
Diablo 4 Streamer Wudijo just shared a post where he showed that you can put three Crafted Mythics of the same type into the Cube and combine them into a new Mythic. Not only is this a good way to recycle old Mythic items that you do not really need, but it turns out it also removes the Crafted tag.
wudijo@wudijo𝕏New insane cube tech: you can 3:1 CRAFTED Mythics and it will clean the tag so you can use the "Upgrade to Mythic" recipe on another piece #DiabloIV
He basically put three Crafted 
Eaglehorn into the Cube, and he got another Eaglehorn that did not have the Crafted Tag at all. So you could technically wear multiple Mythics coming from the cube thanks to this. It is a pretty cool trick if you wanted to wear multiple "crafted" Mythics from the Cube. You can just throw them in there and try your luck.
The problem is that it does not work like the 1:1 Crafted Mythic recipe. It will not keep your affixes. It basically just rerolls the items into a completely new one, so do not expect to get the same thing with your maxed-out affixes and everything. It is not a replacement for the normal Upgrade to Mythic recipe if you have carefully put together a Unique with exactly the stats you want. The whole point of that recipe is being able to take a carefully prepared Unique and turn it into its Mythic version without throwing away all that work. Instead, this looks more like a nice way to reroll your left-over Mythics and try to get something better.
So if you have too many useless Mythics, throw three bad ones into the Cube and see what happens.