Simulator construction allows to many of a structure
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In the simulator (potentially in the main world as well, not tested). You can make as many construction sites of STRUCTURE_EXTENSION as you want if done within the same tick.
If the game allows you to make at least one of these, you can make as many of them as you want as seen below.
For example if you are control level 2 and tell the game to make 6 construction sites of EXTENSION it will make all of them. The game only complains once it has to complete one of them (building gives -14:
ERR_RCL_NOT_ENOUGH
). Which is another bug since it shouldn't error until you try to build the 6th construction site.
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Fyi: this does not happen in world.