If you rename a structure block in an anvil, then place it, it will switch itself Data mode, which isn't even implemented in Bedrock edition. You are able to switch it out of data mode, but once switched out, you can't switch it back
To reproduce:
In any Creative world with cheats enabled (I had this happen in one of my Community worlds), run the command /give @p structure_block
Using an anvil, name the structure block to anything you want
Place the structure block, you will see the standard Structure block texture and it says "Data mode" when you open it
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Trying to look back at old reports, but this issue is still going on in 1.14.0.52. The only change is that it now shows Data mode, but tells me that I need to turn on Experimental play to use it, even if it is already on.
This is what happens when the version search doesn't show up with the correct version (Not blaming Mojang for it)
Not fixed in 1.10