I had made a big structure with lots of command blocks in a 1.13 snapshot (18w05a) but when loading it (deathswap.nbt) in the latest version (1.13), Only the barriers and a single chain command block were loaded.
I expected either nothing to load or it to load properly, so this is very strange that the structure only loaded one of the command blocks.
The structure loads fine on older snapshots.
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I'm having an issue with structure blocks freezing my singleplayer and multiplayer worlds just for loading a structure of the maximum size.
Basically almost everything quits working (mobs, chunk loading, etc). Even tested on my own personal server, and I timed out and could not reconnect for like a minute until the server finally caught back up.
edit: hmm, It almost seems like it may be because the structures might not be up to date. I last updated them just after the flattening in the snapshots. Once I manage to load a particular one, loading it again is much more normal.
I can confirm the behavior described. The log reveals a JSON error is thrown when loading the structure, and inspecting the NBT reveals the source: the CustomName of each command block is invalid JSON (read: out of date), and this is not upgraded by the game itself (MC-122174). Therefore I can safely close this report.
I can confirm that this does happen. I have to re-save the structure every time I load the world in a new snapshot, otherwise all command blocks and other block types don't load at all.