Prevent temporary terrains from overriding one an other or "loosing" the default terrain

game/modules/tome/data/chats/temporal-rift-end.lua

game/modules/tome/data/quests/staff-absorption.lua

game/modules/tome/data/talents/celestial/twilight.lua

...dules/tome/data/talents/chronomancy/spacetime-weaving.lua

game/modules/tome/data/talents/chronomancy/timetravel.lua

game/modules/tome/data/talents/gifts/cold-drake.lua

game/modules/tome/data/talents/misc/inscriptions.lua

game/modules/tome/data/talents/misc/npcs.lua

game/modules/tome/data/talents/psionic/distortion.lua

game/modules/tome/data/talents/psionic/dream-forge.lua

game/modules/tome/data/talents/spells/earth.lua

game/modules/tome/data/zones/paradox-plane/zone.lua

game/modules/tome/data/zones/temporal-rift/zone.lua