Perfect Forest Warrior losing onslaught

So I got "perfect forest warrior" corpse from vendor and made a spectre of it. Everything seems fine untill I leave main area temporarily.

Example 1: During campaign, entered Ravaged Square (act10) and had the onslaught buff. Entered the side quest area, did that, and when I came back to Ravaged Square I had no more onslaught buff (even when I was next to the spectre). After entering the next area I had the buff again.

Example 2: Entered a map, had the buff. During mapping I took a portal to hideout to empty inventory. Returned to the map and no more onslaught buff for the rest of the map.

Spectre doesn't die at any point and I'm usually close enough to it so I should get the buff.

I'm seeing the same behavior with the Perfect Forest Warrior

Made video about that. Please fix it! :)

https://www.youtube.com/watch?v=8Bw5hfA71k4

After more testing - it is totally random when you lose Onslaught.
You can enter map- return to hideout- buff lost. or not.
or enter map- buff ok -> then return to hideout- buff ok -> return to map - buff lost. -> new map - buff ok again...

and so on....

Have same problem, aura works only in "New" area, if u was not in your hideout for long time it start work or if you open map or somethink first time in 15 min area life, aura will work, but if you teleport to where were before, aura doesn't work