I'm using GameTest.

EntityCreateEvent, called by loading entities when travelling to another dimension, has illegal property of entity.

event.entity.id, event.entity.location and event.entity.nameTag throw error "can't call property" (and also other methods can throw error.)

If I leave the dimension after an error occurs and return to the dimension again, the event will have properties that work correctly.
And if I repeat the process, the next time the event has error.

(go to nether) no error -> (go to overworld) error occurred -> (go to nether) error occurred -> (go to overworld) no error ->...