Can't place landing pad

[DevilinPixy]

Someone else asked the same question about doors. You can find answers to it in the below linked reply and the full topic it is in:

Electricity and Piping 101

The door to my main building on my base stays open. It won’t close. My base is fully powered, so I’m not sure what’s going on. I don’t need to run a dedicated power line to the door do I? I’m hoping it’s just a bug, but I wanted to make sure.