Mark,  I say that CS programmation is right. My airplanes never miss TD and my FMC always has the message " End of rte" after landing.  Will also show the message if I missed the approach and fly over that point. !!
It is only that some computers dont read it ! Why?  I dont know.
My 67 is the only one perfect in the descent. It will get to ED proper,
with the desc path bug, in the middle. My other two, are always early.
Why?  I dont know. Stars and Trans are full of surprises !
My airplanes capture the wpts of the Trans but will not capture the Star
wpts - I have to use Heading and manage some tight turns.
The logic of the Clb is off for the three airplanes. Otherwise it is pretty near perfect.  ;D  :o

Raymond    Boeing or nothing
KFLL     South Florida