The Bug

You cannot put a block on a block with an interface with "Shift + Space" while flying.

How to reproduce

To reproduce this bug, you must:

1. Put yourself to fly in creative
2. Press the "Shift" and "Space" keys at the same time
3. Try to place a block on a block with an interface

Example: A button on a command block

Example

Here is an example in video: Cannot put a block with Shift while flying.mp4