Guild Wars 2

As per title, is it a bug that if i cast a conjured weapon and then get downed (even if only for a split second) i loose my conjured weapon as soon as i get back up?. The same thing also happens if you pickup a quest related item (like a frog for the frog trap quest), it automatically makes you loose your conjured weapon your holding.

This is a bit of an isssue as the cooldown on them isn’t exactly short (3 minutes on a fiery greatsword), i can cast it and use it for all of 5 seconds and then pickup a frog for a quest/get downed for a few seconds and then loose it and have to wait minutes for it again.

So i ask, is this a bug and are they ment to stay equipped under the above 2 conditions?.