Despite what the game tip tabs read, the Jackbots CAN be overhealed. Otherwise, I have no complaints, even though sniper freeze traps-followup headshots seem a bit insulting.
Jackbots can be overhealed. Usually in the time it takes the jackbot to march from your base to theirs, unless the other team knows what they're doing and picks you off first. It's in the known issues thread at the top of this subforum. Uber already knows about it and it'll be addressed in the future.
Its still a glitch. It doesn't work everytime, in fact it has never successfully worked for me. You rarely come across overheales jackbots because the glitch rarely happens. Every jackbot u met would be overheales otherwise ;D