[Riven mission bug]

From the night wave mission I got the melee riven which had the mission “kill 6 Dargyn pilots before that hit the ground in one day” so I went to Plains during day time and killed one and sure enough got the progress but I realised that night was comin soon so I backed out and thinking the riven would reset but it didn’t and I have tried everything even waited in plains when night came but even that didn’t trigger the failed riven noti I have tried killing numerous other pilots before that hit the ground but my mission progress is stuck at 1/6.