Hello. Ill try and make that a little clearer.
My mission was to drive to several locations in turn, a new destination revealed at each location. For me, this was indeed 4 locations.
i had collected some science with no value at this point. Upon reaching the 4th destination, named 'TREE' I did several experiments nothing happened. Then, after writing issue here, i did 1 more experiment at 'tree', that had some science value.
This solved:collect science at 4, and 'vessel: any'. 'vessel: any will complete when science is done.
just collect science at every destination, especially the last one! and make sure the science has some value. Keeping a 0 value experiment doesnt count.