All game modifying spigot version code.
As soon as the eye of ender entity is spawned the plugin changes the location it thinks the stronghold is by shifting it 4 blocks on both axes
This is all the game modifying fabric version code.
This code shifts the position it thinks the stronghold is by 4 blocks on both axes right before it is assigned to the eye of ender.
North facing stronghold diagram
This images shows that from versions 1.19 - latest it will get into the stronghold but 1.9-1.18.2 will miss in most cases. The 1.9 betas point directly to the stairs.
South facing stronghold diagram
This images shows that from versions 1.19 - latest it would miss but versions 1.9 - 1.18.2 would hit. The 1.9 betas point directly to the stairs.
East facing stronghold diagram
This images shows that from versions 1.19 - latest it would miss most of the time, but versions 1.9 - 1.18.2 would hit. The 1.9 betas point directly to the stairs.
West facing stronghold diagram
This images shows that from versions 1.19 - latest it would hit but versions 1.9 - 1.18.2 would miss. The 1.9 betas point directly to the stairs.