Java Edition:Invalid Nether Portal Configuration

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Throughout multiple Minecraft versions, there have methods of obtaining invalid Nether Portal configurations.

Inverse Nether Portal.png

Invalid Nether Portal Configuration
An invalid nether portal configuration, commonly known as a "Pether Nortal".
Type	Block

Obtaining

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=== 23w13a_or_b Votes ===

Warning: April Fools' 

This feature requires April Fools' versions which may require file renaming or file deletion to load. See the Loading April Fools' Versions tutorial for more information.

The April Fools' snapshot 23w13a_or_b introduced several methods to obtain normally unobtainable features, including Invalid Nether Portal Configurations.

Update Suppression

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Main page: Update Suppression

Another (yet much more complicated) way to obtain Invalid Nether Portals is through Update Suppression.