My recently to Java Edition 1.18.1/22w03a converted flat world has chunk generation bugs

Hi folks,

In May 2019 I've created a Minecraft: Pocket Edition world on my Apple iPad (5th generation) and yesterday on the 1st February 2022 I decided to convert the Pocket Edition world to a Java Edition world. But when I'm currently playing inside my new Minecraft world, the new chunks after X/Z=500 aren't generating anymore on Y=4, they're generating on Y=-60. Is this a bug and if yes, can you please fix it? I saw that this very ****** issue is also occurring on 22w03a, but not on 1.17.1 and below...

Sincerely yours,

Mika Kreis 😊