Earlier, I created a Plotme world using Multiverse-core. While I was building in that world, I noticed that there was no block movement whatsoever. By this, I mean that blocks were not falling, and liquids would not flow. I tested to see if this problem occurred in every world, but it turned out that it was only present in the PlotMe world. I checked my essentials yml, and it's perfectly fine, so what could be the problem?