Hey ShastaLite and drudollaz - thanks for posting here on the forums to report this issue! 
The devs look to already be aware of this issue, and have been able to reproduce it. They've also been able to reproduce that headshots refresh the timer as intended if the decoy is on cooldown, as ShastaLite stated occurs. As soon as we receive any further information regarding this issue, we'll update the forums.
drudollaz - I merged your thread with this one, as the primary issue mentioned is the same as here. Regarding your second issue, are you able to provide a short video showing that the Mantis scope does not zoom? Thank you.

The devs look to already be aware of this issue, and have been able to reproduce it. They've also been able to reproduce that headshots refresh the timer as intended if the decoy is on cooldown, as ShastaLite stated occurs. As soon as we receive any further information regarding this issue, we'll update the forums.
drudollaz - I merged your thread with this one, as the primary issue mentioned is the same as here. Regarding your second issue, are you able to provide a short video showing that the Mantis scope does not zoom? Thank you.