With recent addition of "technical blocks" in redstone tab, structure block is missing.
Also with the "Operator-only blocks and items can now be found in the Redstone Blocks tab" directive, why not add it?
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The structure block doesn't appear in the Redstone Blocks tab. The jigsaw block does, so this may be an inconsistency. I won't be surprised if it is works as intended but it's probably not.
slicedlime
Can confirm.