Steps to reproduce (on a server or a client):

• Place a Reactor Input, Energy and Output in a line (in any order).
• Place a Reactor Chamber Controller on top of the middle block. (Fission or fusion, it does not matter)
• Break the bottom row of blocks (the Input, Energy and Output)
• Observe that, upon breaking the Reactor Chamber Controller, the broken row of blocks return.

I have a solution in mind, will open a PR.