Striders removing buffs?

Does anyone know if it is intended that when you get ona strider you lose some buffs. (ie Battle Roar and BD buffs are gone). Or is this a bug?

bug, it used to happen with any potion based buff but they fixed it in C5. Is it any BD buffs or just certain ones?

Appears to be any, and the Battle Roar disappearing kinda sucks as it drops over 1k hp off. The BD buffs can be reapplied, Battle Roar I have to wait 10 minutes for. And being as I am a destroyer, thats over 300hp lower that my health has to be for me to throw my skills.

I think some are on purpose and some are bugs. Buffs or skills that disappear are often those you can't use while mounted.