If a structure block or /structure is copied to a structure using the 'flip xy axis' option, the trapdoor orientation will be incorrect.

Steps to Reproduce:

1. Structure blocks, or use /structure to save structures.

2. When loading, use the option 'xz-axis inversion'.
(The same end result would be achieved if only the x-axis or only the z-axis was inverted.)

3.Load. The trapdoors are all facing the wrong way, and some of them have even opened up.

Observed Results:
{}The trapdoor was oriented incorrectly after the application.

Expected Results:

The trapdoor is placed in the same orientation as when it was copied.

Before copying or loading without inversion

After loading using inversion.