structure block fails to build wall, but image maps get made

[codeulike]

Mostly its working, I end up with a structure block that looks like it wants to build a wall with the image-maps on it.

But when I 'load' from the structure block, the wall fails to materialise and all the maps and item-frames fall onto the ground.

By picking them up and building the wall myself (bit like a jigsaw puzzle) I am able to get to the right end result.

But I'd like to log that the structure block is not building the wall properly.

Version: Minecraft - 1.20.51 (Bedrock)