With regard to the mileage issue, it appears the DTL Driver’s Logbook is also only recording the last section of the drive that you load in from the save before completing. Although now my Tier 2 is showing complete even though I’ve only done 354 of the required 402 km…
mastery seems to update very randomly. I did a scenario for which i got Xp but did not count as a scenario. The next day i did another on and after that i had 2 scenarios completed.
I've got a letter from DTG Support : Hi, Thank you for reaching out today, and we are sorry to hear about your troubles with this month's mastery challenges. After a short investigation, we have found the problem and updated the challenge. It should now be possible to complete, and we would like to apologise for any inconvenience caused. Should you experience any further issues, please get in touch and we'll help you troubleshoot. Kind Regards, Chris Player Experience Manager Dovetail Support
I just hope that DTG will test any further 'experimental' challenges they come up with more thoroughly. Lately, most of these new concepts were bugged at first and later fixed (albeit reasonably fast).
Distance recorded from a resumed save has always worked like this, presumably because the distance previously driven doesn't get saved, but you can log it by quitting out to the main menu I believe, same way that distance is still recorded that way even if you SPAD.