I first created this world in snapshot 20w17a and travelled to this place, and found this unexpected structure. It even has 2 stone brick stairs blocks on the top! And I re-created this world in 20w18a, and tp to the same location to see if this happens again...again.
world seed: -8649121689888007729
coordinates are shown on the screenshot.
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Comments 3
Those are ruined portals. However I believe that there is no correlation between it being in the same spot in the latest 2 snapshots - the portals were added in 20w16a and made to spawn less frquently in 20w17a. Maybe a mod or helper might say if this feature of ruined portals is intentional (i.e. (partially) hidden away/buried) The link NewcomerMC gave says Ruined Portals can be found buried in sand;
"Shattered remains of ancient nether portals. Wonder who built them?
They can be found in any overworld or nether biome
Some are hidden underground, under the sea, or buried in sand
" - Adrian on snap 20w16a
Thank you for your report!
However this is a Duplicate of MC-178986.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
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https://www.minecraft.net/fr-fr/article/minecraft-snapshot-20w16a
This is a new feature, "Ruined Portals"