I dont know if this is a bug, but Better I comment on it
In the server when i play.. they have a option activated in your emulator.
To be exact, is this:
// Set this to 1 if your client supports status change timers and you want to use them
// Clients from 2009 onward support this
display_status_timers: YES
in the client is something like this :

..
In my Openkore, When I was using a skill, in Statuses were: Unknown 46..
But, Skills without timers, which were showing it perfectly, Like Ruwach, Sight, Cloaking*
*Cloaking also has timer, but after 3 or 5 seconds, the timer disappears
This image may help to you

Researching a bit .. I found this xD
Added support for new status change packet, uses new setting display_status_timers in client.conf.
Sry for my bad english ^-^