-63 height consists entirely of bedrock (parity problem)

This bug report is a parity issue with Java.

Summary:

In the Java -63 version, the height does not consist entirely of bedrock, and in the bedrock version it is completely bedrock.

Steps to reproduce:

1. In creative mode, dig to -63 height.
2. Dig a little horizontally at -63 height (about 10-15 blocks).

Observed results:

At -62 altitude, sometimes a stone appears. But -63 height consists entirely of bedrock.

Expected results:

-63 the height should also consist of more than just the bedrock.