Teleport [Comet Rush] + Avian Puppet

What went wrong?
Having an active Haste-Buff while skilled into Teleport [Combat Rush] - which should extend the active Haste buff by 4 seconds - the aviane puppet seems to be prirotized and the you will not receive a 4s Haste buff but only a buff which is of similar length as the implicit of the used Avian Puppet.

While it is no Problem without other sources of Haste it is doesn’t feel good and intendend when, e.g., specced into Flame Ward [Flame Runner].