All of the unique level 4 vendors are broken, but specifically the ones found in random wasteland encounters, Smiling Larry, the Scribe, Doc Anderson, and Ron Staples from my own personal experience, but according to the internet they all are, across all three platforms. When you speak to any of the 4 random encounter vendors and recruit them/send them to a settlement, everything seems fine and your population count increases by one both in your pipboy workshop menu and in the map menu when hovering over the settlement you sent them to. However when you fast travel to the settlement the population will have dropped back down by one, and the NPC will have effectively disappeared from the map permanently. Tonight I found Doc Anderson by the campfire on the river nearby Westing Estate. I decided to try to escort her to my settlement on foot after recruiting her this time, so I did the recruitment dialogue and then waited. And waited. And waited. She walked around in small circles and occasionally sat down for 6 game days, then when I got bored and walked far enough away for her to despawn, she disappeared off the map and my population count dropped by one. Having done some research on this myself before coming here, it seems that PC players on the Steam forums found the broken code that causes this issue and figured out how to fix it themselves a month ago. So why haven't you Bethesda? I just spent a good 20 hours and easily 10,000 caps making a market settlement in preparation for this feature that doesn't work. That makes me want to play something else.