DDP

DDP is a special debug tool that was in game since Alpha 0.0.7 up to Prerelease 0.0.8b. Since prerelease feature removal it is still accessable through /rule EnableDDP true. The default look of DDP is [0, 0, 0, 0]. The zeros is a objectID value of nearest tiles. Usual tiles have objectID set to 0 so you can't interact with them. But crafting stations and chests have different from 0 values. The DDP added because developer had many problems with chest spotting. These days is pretty useless and generally left in the game only for modders.