Structure Block bounding box 'off' toggle not honored until block activated by redstone or GUI accessed.

When a world is loaded, Structure Blocks bounding boxes are shown regardless of if their block's  show bounding box toggle is set off, until the block activated by redstone or its GUI is accessed.

In the images attached, the world had just been loaded.  No gui settings were not altered before it was closed.  Redstone activation also removes the bounding box .