Practically Research Bodies is broken on KSP 1.11.2.   There is a fix to it, but it's annoying.  Go to your save file, find "isResearched" without the quotes, then scroll down to  VESSELSINSOI { } and delete that section.  So if it looks like this:             VESSELSINSOI             {                 CELESTIALBODY                 {                     body = Neidon                     VESSELINFO                     {                         vesselId = 1275415811