If you put spawnpoint before completing the end portal, if you ill yourself it gives you back in the end and you are stuck there forever. You should delete your spawnpoint after you the game.
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duplicates 1
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We're tracking this issue in MC-175255, so this ticket is being resolved and linked as a duplicate.
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Assuming you have commands enabled, you can get out of the end by doing
/execute in overworld run tp @p 0 100 0.