My reaper sent to collect souls at a house with a "no ghosts" sign.

My reaper sent to collect souls and fix nether fissures at that Aether lot. No problem finding and fixing the fissures but there were no souls there.  My reaper stayed there for hours and I looked over every inch of the place. I found a "No Ghosts" sign on the lost. Would this be the reason why there were no souls? My reaper is level 8 and I've never had this problem before (using a couple of mods and it still worked well).  The only cause I can think of is that sign but I've never seen that sign before and I don't really know what it does.  Anyway, my reaper ended up stuck on the lot until the end of his shift. I just want to know if this is a bug or if the game is working as it should.