Sorry for the late reply.
The vagrants are west of the Optis workshop. Near the yellow cave.
Yeah. I already found them, thanks. West of Optis workshop, near the Yellow cave, is the bad directions, tbh. I just started the game and don't know where is Yellow cave, and first time I travelled west of Optis Workshop I found only the junkyard.
I found yellow cave but not the vagrants which direction should I look from yellow cave or are they inside?
My bad...There was a bug that prevented the vagrants from appearing next to the yellow cave. Now it should be solved.