Parity issue: Where the void start platform generates is different to Java

The Bug:

Where the void start platform generates goes from block position (X:16,Y:-64,Z:16) to block position (X:-16,Y:-64,Z:-16) instead of the Java void platform block position from (X:24,Y:-61,Z:24) to block position (X:-8,Y:-61,Z:-8).

Steps to reproduce:

1. Create a world with the Void flatworld preset, cheats enabled and in Creative Mode.

2. The next steps show where the void platform is supposed to generate using diamond blocks:

3. Run this command: /setblock 24 -61 24 diamond_block

4. Run this command: /setblock -8 -61 -8 diamond_block

5. The next steps show where the void platform actually generates using gold blocks:

6. Run this command: /setblock 16 -64 16 gold_block

7. Run this command: /setblock -16 -64 -16 gold_block

8. Notice the void platform generation position is completely different to Java.

Expected Results:

The void start platform is supposed to generate from block position (X:24,Y:-61,Z:24) to block position (X:-8,Y:-61,Z:-8) as indicated by the diamond blocks.

Actual Result:

The void start platform generates from block position (X:16,Y:-64,Z:16) to block position (X:-16,Y:-64,Z:-16) as indicated by the gold blocks.