There is a bug with the shortcut keys for metal and radioactive extractors ( Q and W).
To replicate hold down Q or hold down W and then start spam clicking the left mouse button while holding down the shortcut key.
Result is this:
This occurs with more than just the metal and radioactive extractors. I was able to replicate this bug with every other building that I tried.
Left clicking is not necessary to generate the 'ghost-buildings'.
Thanks for reporting. I've passed this along to the devs.
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