Openings with the same height as their wall cannot be duplicated and become invisible

Description:
When an opening is created with the exact same height as its parent wall, it enters a bugged state.

It cannot be duplicated, and after reselecting the Opening tool, the opening preview becomes invisible. The tool remains unusable until its parameters are reset to their default values.

Steps to reproduce:

1. Create a wall

2. Create an opening with a height equal to the wall height

3. Attempt to duplicate the opening

4. Reselect the Opening tool

5. Try to place another opening

Actual behavior:

• The opening cannot be duplicated

• The opening preview is invisible after reselecting the tool

• New openings cannot be placed until the tool parameters are reset to their default values

Expected behavior:
Openings should remain valid when their height matches the wall height, be duplicable, and the Opening tool should continue to function normally without requiring a parameter reset.