MabiPro: The Authentic Old-School Mabinogi Experience

So me and my friend were doing a Siren Dungeon using our strange shard and we stumbled upon the typical 4 treasure chest placed in circles with enemies guarding it. Naturally we killed them all and went for the real one, but somehow, there was an invisible barrier between us and the chest, so we couldn't access it.

We tried walking around, but nothing seemed to work. Luckily, we found out that you can actually play dead and fall to the chest to retrieve it. Did it also happen to someone else?

Picture of us trying to get to the chest, but getting stopped by the barrier: https://ctrlv.cz/9ayi