A lot of developers from our community are faced with the same issue from time to time trying to import new models with their skeleton to DayZ. Most of us still can't figure it out, the rest know how to fix it but don't provide an answer.
All I am asking for is comprehensive documentation or an answer about what exactly leads the model to this behavior (vertices weights, their amount, anything else?)
I spent a lot of time trying to find any regularity of this issue but I still can't put all the pieces together. I've tried many different ways to get it to work or localize it somehow, but it doesn't help at all. From my observations, I can clearly say that vertex weights and their amount are not the only reason that causes this issue and even having a model where every single vertex has weights not greater than 2 the issue is still reproducible. Also, I am sure that I didn't reach any bones limitations (if they even exist) because of another Burer model with the same bones, bonenames, anims and selections exist and works fine. Thanks a lot! Here are the screenshots of the problem {F3976469} {F3976471}
{F3976479} (@Hunterz 's dragon)