When migrating to the new packing API, pin_unselected was not implemented correctly. Regression from rB143e74c0b8eb, rBe3075f3cf7ce, rB0ce18561bc82. Differential Revision: https://developer.blender.org/D16788 Reviewed By: Campbell Barton Duplicated in blender-v3.4-release as rB3dcd9992676a