it should be shown as white for consistency since after the core is destroyed if becomes a neutral stucture. this is happening in the HUD, in the map the base is shown in white. Look at the power station in the example
Not really a bug- more a "known issue". For some reason it defaults back to red sometimes ... and as this functionality is burried beyond some code, although it has no bad effect, the fix-prio is a bit further down the line I am afraid.
STEAM Screenshots can only be linked here. If you take Screenshots with F7 you save them on your PC. Those can be uploaded here.
What happened with the ... transponder block i think it was called once in a time? remember it being on top of drone bases and when that was removed the base marker disappeared from the map entirely