Rc guy garage and rc driver both had the problem. The axles are not the same they are different part numbers from the v1 optional axle i believeThose CVD's have had that clip from the beginning. Mine were installed in 2020 and they have that clip. This is not a new part. IMHO, that "Arrma will fix it right away" is influencer speak for "Yeah, it broke, and I know I need to talk about it, but I don't want to talk about it became I got free trucks, so I will blindly accept Arrma's excuse and say it won't be a problem for you"
Maybe the v3 will get a "Saf-d-ring" like the 6s diff input, but I really doubt the v2's will change.
With all that said, the C-clip has never been an issue for me.