So I found strong hold searched for ages but could not find the portal. So I made a copy of my world and in the copy I searched for it even more by blowing up the thing, but only the walls. And if i were to blow up the end portal it would have been obvious. I was very mad that the stronghold did not contain a portal because now I cannot fight the dragon for go to the end city and complete the game. Please fix this bug.

here is the seed of that world

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And the position of the stronghold.

Position: 213, 33, -750