I was to clear out University Point with the squire watching. I killed 3 synths, and then the mission indicator on the map disappeared.

No other Synths are appearing, I have tried everything to get them to appear. Reloading the game does not help. I can't finish the mission, and can't get rid of the kid.

I am sick of the squire following me around and telling me his story over and over.

Has anyone else had a similar problem? Any fixes known?

As I reported in my thread, this 'lost mission marker' is also affecting in the Minutemen settler task, such as rescuing, clearing enemies out, etc.

So far I know, there's no way to get around this. Reloading, sleep in the game won't do good. Currently I'm ignoring Abernathy Farm and stay out of anything that will start their "Clear Out Enemies at Blabla".