The bug
An underwater structure generated inside of the end portal, overwriting one of the frame blocks, making it impossible to use. I filled out all of the eyes where possible, but the portal didn't activate.
I've seen something like this happen before - one of the underwater structure type things on a beach generated inside of a desert temple. I understand things like caves intersecting abandoned mineshafts, but some collisions don't make sense or are game-breaking. I mean a quick fix would be to just generate the end portal frame last, giving it implicit priority.
In the picture attached, you can see that I broke the block that actually overwrote part of the frame, because to be honest I was on my personal record speedrun and I was desperately trying to see if I could get it to work, not thinking about bug reports.
How to reproduce
Seed: -5074757443285590333
Coordinates: /execute in minecraft:overworld run tp @s -1271.63 37.00 -998.00 164.70 36.90Linked issues
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Comments 3
I did double check my seed/coords in 1.15.2, but the underwater structure isn't there in 20w19a
It seems that in 20w19a the spawns of underwater structures have been 're-rolled' in the sense that their generation has either been changed (I think they were made more rare at some point) or the random number generation has been used in the part of the wold generation before underwater structure locations are assigned. One youtuber noted that this happened to ore locations in one of the snapshots.
Thus in this particular seed there is no longer either the structure intersecting the end portal frame nor the surrounding underwater structures (they often generate in groups, as is the case here in 1.15.2).
It is unlikely that the underlying issue has been fixed - that it is possible for some structures to generate on top of the end portal frame and overwrite some of the blocks.
This is related to MC-173032.
This cannot be reproduced with the provided seed & coordinate pair in 20w19a. Either fixed or might need to find another seed/coordinates.