In creative mode, the player can start flying by double-tapping space, but cannot if they are standing in the center of 4 underwater magma blocks.

Steps to Reproduce:

1. Build a 2×2 square of magma blocks underwater (must have water sources above) as shown:
   
2. Stand in the center of the 4 magma blocks
3. Double-tap spacebar

Expected & Observed Results:

→ Flight mode will not be activated
→ Flight mode would be activated

Notes:

1. Related to MC-268947 MC-256811 MC-147790 MC-68453
2. This behavior is unexpected when compared to the fact that the player can enter fly-mode when standing inside a single bubble column.
3. This issue was updated after it's original triage date by Jingy on 3/5/2024 to be a bit clearer, but still retains it's original information.