this happened to us three time ine the last months (so already before 4.6). When entering the final map of a pilgrimage, the nurgle curse would be Miasma of Pestilence and the relic would spawn out of range. I’m guessing on the shrine at the end of the map given the pointer position.
On the icy arena this has caused us to simply loose the game as the relic was on the second level of the arena, on fortitude, the relic eventually respawn… behind the closed doors accessing the end… we had to hold the full fight within four meters of the door to stay in the purification bubble.
I simply don’t get why the relic isn’t programmed to spawn right at the feet or even in the hands of one player from the beginning.