Structure Block selection box relative position or size doesn't update immediately

If you change relative position (or size) of a structure, it updates only if you press Done, Load or Save.
But if you rotate the structure or mirror it, you see the selection box rotation immediately, without exiting the GUI.

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Old description:
If you press 'Load' on a structure block to place the boundary, then make a change, such as relative y paste value, then press 'Load', it places it into the world instead of placing the new boundary first.