its a bug of the game happening for a long time now (over 3 months), this is not in relation with other players or cheating.

on siptah map, teleport stone can randomly disapear, especially when in area of the storm. but there is no logic, a teleport stone can be there for 10 days, and one day no more teleport stone, and event log saying nothing. or it will disapear in 2 days, or in 20 days, no logic.

try to build in an other area.

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