Motivation and Context

Fixes #18737

Description

The old condition skipped the -x for ANY property whose source wasn't explicitly ZPROP_SOURCE_VAL_RECVD - which caught inherited/default properties too, not just locally-set ones. The new condition correctly skips only when the property is locally-set on the destination (source == fsname), which is the documented intent.

How Has This Been Tested?

Tested with steps described in bug description.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Quality assurance (non-breaking change which makes the code more robust against bugs)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.