This was addressed a few weeks ago by @TC_Sera
Its still in TCs view of getting fixed but i dont think its high on the agenda as TC has recently re-written their roadmap for gears 5 in terms of content getting released and general overhaul of certain aspects of the game.
They were originally meant to “sunset” Gears 4, which would’ve included making those skins craftable, but they never got round to it after the disastrous launch and general existence that Gears 5 suffered.
I wonder man if people still plays Gears of War 4 .
Most likely, yes. I’ve felt like returning to it myself many times, trust me.
Baaaaaaa 
On September 1, I wrote about this in the topic, and put in a copy of TC_Sera, but no answer came, my question was simply ignored.
Here is my answer to the promise of TS_Sera to understand this issue:
So the summer has passed (and the update in part 4 has not arrived, the achievements: I Like Em Crispy and Better Than Bacon are still unavailable. How is GAZE doing? Is there any specific information by what date to wait for the update?
many are waiting for this update, but not many are writing about it, not many are contacting support on this issue. I am very grateful to you and to all those who raise this issue, I hope someday the developer will turn his attention to us and fulfill his promise. I myself have begun to play the games of this developer less and less often, since I myself am a perfectionist and I just cannot concentrate on the new 5th part without completing the 4th part by 100%
I tried to get your joke, but couldn’t:
Well I would explain but not in an explaining mood right now, try again after 2pm
I’ll wait…
Baa baa Kaz sheep have you any wool?
No sir, no sir, you’re getting none, you fool! 
I googled it. Urban Dictionary labels a “sheep” as “A waste of flesh and brain cells”.
If that was your intent, interesting. Part of me likes it.
The other part is annoyed at the forum filter.
I’m gonna wait also ahahahhha 
Good thing I wasn’t talking to you then.
They say keep your friends close and your enemies closer.
That’s ok, wasn’t waiting on a reply to myself anyhow 
But anyway, I’ll still wait, you seem worth it 
TC does not provide a great deal of support to their titles once they become legacy. Ultimate Edition is literally completely broken on PC and has been for over a year. Multiplayer does not work at all, and the campaign suffers from bug-induced performance issues.
I wouldn’t hold my breath on Gears 4. Maybe it’ll get some basic support someday since it is TC’s baby, but it will take a long time and be minimal.