Giant Oak Trees do not replace the block below the sapling with dirt upon growth.

When describing your bug, use the following format:

Steps to reproduce the issue:

1. Place a moss block on the ground.

2. Place an oak sapling on top of the moss block.

3. Grow the oak sapling into a giant oak tree using bone meal.

Expected result: The moss block directly underneath the giant oak tree sapling should be replaced with a dirt block. This is consistent with how other saplings (e.g., normal oak, birch, spruce) replace the block underneath them with dirt upon growth. This mechanic is especially crucial in game modes like Skyblock, where replacing a moss block with dirt is a vital method for generating new dirt.

Actual result: The moss block directly underneath the giant oak tree sapling remains unchanged after the tree grows. It does not get replaced by a dirt block, which prevents players from reliably generating new dirt in Skyblock environments.