When you have an .mcstructure file in a behaviour pack on an MC Bedrock server, and you try to load a structure, it'll show the bounding box of the structure you're trying to build, but it won't show the blocks.
Please network the structure contents to the client so they can preview before building. I've accidentally destroyed parts of my world because I couldn't tell where the structure was going to end up, it wasn't previewing properly.
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