No I am not playing koth on dev branch.
BUT, here's my reasoning as to why I posted it here:
1. To my knowledge, there is no place to post bugs or direct attention to bugs.
2. When you google "Arma III bugs" the first link is to dev.arma3.com
3. This is the "dev branch" section of the forums.
4. This bug is in prod, so it's probably also in dev too.
All of this made me think that this was the correct place to post about the ticket. If there is better place for me to direct attention to it, please let me know and I'll post it there.
Also you mentioned lock-on. I'm only talking about wire-guided missiles. It could be the case that there's an issue with lock-on too, but I wouldn't know about that.