GPU memory values in the Preview debug header are not accurate

Steps to Reproduce:

1. Open Minecraft Preview and Task Manager

2. Look at the Mem, Max, and Free values in the debug header

3. In Task Manager, go to the Performance tab and click on GPU

4. Compare the in-game memory values with those in Task Manager

Observed Results:
In this test, the debug header reports that the game is using 5.4 GB of GPU memory while Task Manager reports 3.3 GB.

The debug header also always reports that 134 TB of free GPU memory is available, which is impossible. I only have 16 GB of GPU memory, and only 12.7 GB of free memory was available during this test.

Expected Results:

The debug header should accurately report the amount of GPU memory being used by the game and the free memory available.

Screenshots: