On startup you enter the debug mode in spectator view. This can be change with "/gamemode 1" to creative view.
When you step on any of the 4 not activated pressure plates it will spit out a ton of that pressure plate you're on, slow down minecraft and make some weird noise.
If you step on an activated pressure plate nothing happens.
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Dupe of MC-58898

Don't do that then. The debug world is only for observing how all the blocks in all their possible states render, generally for testing resource packs. You're only supposed to be in spectator mode in the debug world.