Okay if you know you're gonna die in the farm world...know.your.surroundings! cause I died in the farmworld and there was no waypoint to my grave, so if you die in the farmworld...good luck getting your stuff back...
I tested this, it seems to work for journey map... I don't know why but I dug around in the coding for the farm world a bit and I couldn't find why it was conflicting maybe there's a conflict in the voxel map coding?
probably fault of voxelmod if journeymap is able to handle it correct. well, you could try /getpos in farmworld/overworld to see if there are some values which aren't different, but at all that would only help to make a more detailed bug report for the voxelmod autor
The /getpos command...sorta works? It works 100% of the time in the over world but in the farm world for me it works like 5% of the time but it gives the coords of were I'm standing not were I died.