A blueprint that gets overwritten after you've obtained its meta item, will make that meta item invalid which is normal.
As soon as you try to spawn in that meta item, it will fail and give you back all your blocks with as message `Can't spawn this blueprint! It was changed or removed. Spawning items in space.`
It does spawn the items in space, but it forgets to drop the source reference of those shapes that use them such as hull wedges, tetras, ... so it drops the real shape as an unusable item.
{F20438}
The above should have dropped 20 Orange hull and no Orange Hull Wedge at all.