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I'm in the middle of writing a mod to intelligently cancel deconstruction orders in certain circumstances -- i.e. when an identical ghost is placed on top of the item to be deconstructed. This can happen in situations where a large blueprint is placed, marked for deconstruction, and then placed a few tiles over as large portions of the blueprint might be identical (i.e. long horizontal belts in a blueprint being shifted to the left one tile)

In the process of this, I realized that attempting to place a blueprint of -- say -- brick -- on top of existing bricks marked for deconstruction results in the existing bricks remaining marked but the new bricks not being placed. However, a blueprint for any different tile can still be placed.

I feel like one of these options should be the correct behavior:

• Deconstruct the existing tile and place the new (identical) tile -- comparable to current behavior, if rather unintelligent
• Cancel the existing deconstruction order

Thanks for the report however that's working as intended. At the moment we don't treat that scenario in any special way - same for most entities when you try to do that.