Can't trigger flying mode in creative while standing in the middle of 2×2 magma block bubble column

The bug

In creative mode, flying mode will enable by double-tap space, but it didn't happen if standing in the middle of 2×2 magma block with bubble column.

How to reproduce

1. Build 2×2 magma block in water
2. Make sure it have bubble column
3. Stand in the middle
4. Double-tap space
   → It wont trigger flying mode