The diamond icon that appears alongside the score on your post-session debrief screen, which is said to denote that this is your highest score for the particular service or scenario, is always given whether it is your highest score or not. This appears to be the case on every service on every route that I have done more than once and on occasions where the score has not only been lower but has been significantly lower than previous scores. I have tested it on many services that I have previously obtained a gold medal by speeding along the whole route to ensure a low score and the diamond always appears. I don’t feel this is a high priority fix by any means but it may be a simple one. It has been like this since release of TSW2, I just hadn’t got round to reporting it until now.