It could take sometime depending on how many people it's affecting it. The devs really have their hands full with bugs from switching engines and incorporating new/old features in the new engine I would really call it an alpha not so much a beta. I feel for your frustration though but this whole 0.63 is/was a big switch. Also a fix would come in an update if it's not something that can be remedied immediately. However since the move to the new engine and the xbox build they have been releasing updates pretty rapidly compared to previous years so you should hear something soon, don't give up hope.

Stable 0.63.149525 fresh install server/client one mod SA-Tomato, happens with or without mod. Must be a sg5k found in game as loot not forcibly spawned as you will see in the clip below also, pay note to the fact that the sg5k I find shows it as having a mag in the UI even though the model has none. I couldn't demonstrate the mag but I know from experience after losing 2-3 of them it does get stuck as well. To add to this, for dayz devs please make sure you're doing you due diligence and playing the game as intended when trying to reproduce steps not just spawning guns/items in and saying "we cannot reproduce the steps please record" because for most people, they are just playing the game and its hard and time consuming to go and find these guns/items to just try and lose them for the sake of video because dayz has no provided admin tool. Which would speed up this whole process. Help us help you...

Stable 0.63.149525. This is a server I created for testing It's pretty much vanilla fresh install of game and server. I'm running one mod the SA-Tomato. The mod itself should have no affect because the bug still persist on a vanilla servers with no mods at all. The bug is mainly happening with rifles and the sg5-k/mp5k this happens with suppressors as well. Also I am the only one on this server. The bug happens to only affect rifles/SMG's that the game loads in as loot and not one that is forcibly spawned. In the video you'll see that I'm finding the AKM at Northwest airfield and the mag I had in my inventory was found moments ago at the airfield. I'll place the mag in the gun I found and will not be able to remove it, then I'll spawn the AKM and a magazine and then I will have no issue. Hope this helps cause I'd like to able to run a server...without these issues eventually...

Stable 0.63.149525 private server no mods. Of course the one time I go to record this after recording many videos of mags getting stuck in rifles it doesn't show my cursor but I assure you I'm trying my hardest to pull that suppressor off.
After, I realized it really doesn't matter if you put the compensator on or not it actually acts the same way the mag glitch does once you put it on its not coming off.

I'll try to replicate it again but it seems to happen with rifles it can't be duplicated by just spawning a character with a gun. You need to actually seek out a gun the server has loaded in their spawn locations simply pick it up and attach just about anything and you will not be able to remove it. In this case this was a private server in which I run and it doesn't really change due to server pop because it happens with one person or many people on the server. If find one again I'll be sure to record it. This is with the latest server build.