End portal doesn't work in infinity skyblock to teleport the player back after killing the dragon

Partner Rank:

1

Partner Team Reporting:

Jigarbov Productions

Verification builds:

1.16.0.53

Summary:

End portal doesn't work in infinity skyblock to teleport the player back after killing the dragon

Impact:

Makes the end game of the top selling infinity skyblock broken and renders their world completely unplayable even after restarting.

Repro Steps:

1. Download Infinity Skyblock
2. Press survival skyblock button
3. start game
4. fly around on skyblocks near the edges of generated areas until you find an end portal skyblock
5. place the ender eyes in it
6. go through and kill the ender dragon
7. use the portal

Observed Results:

once going through the portal after killing the ender dragon, the game is completely unplayable and needs to be restarted. When trying to open the world you just killed the ender dragon in, it is unable to open it rendering the world unplayable.

Expected Results:

the player should appear at the current world spawn after going through the portal and skipping the credits.

Screenshots/Videos attached: Yes

https://www.youtube.com/watch?v=F7cS7C4U4lY

Regression Builds:

1.16.0.51

Notes:

Behind the scenes what is happening is the end portal is being cloned from the spawn chunks at to the location 10 218 10 14 218 14 using clone masked however when doing it manually results in mixed results