Structure blocks don't load some structures properly

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.