I installed this beta (Yes, I got the update confirmation message.). I loaded up my saved game with the "execute" instead of "enslave" issue on Civilians and Settlers. The issue appears to persist. I'm at the "subdue remaining defenders" stage and I am still only able to execute settlers, civilians, and the NPCs unique to Warwick.
However, something is different. Jammer is saying new things, now, it seems. I've never seen before the message about him being mad that I'm still playing house with the minutemen, and it came up immediately the first time I visited him in my latest save. When I rolled back to the Warwick save, I saw another new message I hadn't seen before: he was telling me I better hurry up and get to the attack site, or else they'll think I've gone soft. I had to do a setstage on Jammer's quest to get him to what I thought was a usable state when Conqueror was first released; this new development reminded me of that and it seems worth mentioning. Maybe I should be relaying this on one of the bug reports, not sure.
I will test a few more cases and report back. Side note: in the new raid I just setup, I see that the raiders do retain their power armor when they go on a raid. Love that!
It appears that a fresh raid I setup may work. It now allows me to either "pickpocket" or "enslave" a downed settler, but I forgot to take collars, so I'll have to try again. :P Note I am raiding another settlement, so it's not a perfect deduction.
Now that I took collars, here's what I got. I don't see any dead settlers or civilians anywhere after the battle. I have a functioning vassal after the attack. I was offered the ability to enslave settlers and civilians during the attack. I was able to enslave two of them, and then the third seemed to glitch. I wasn't offered the pop up to send it to a city. I want to say that the first two were settlers and the third was a civilian, but maybe I'm wrong. After that, I didn't get any options on the other downed civilians or settlers. There was a short time (10 seconds?) after the battle finished where I was still able to, in theory, collect slaves, since the settlers/civilians were still "downed", but without the option pop-up wasn't able to actually test that.
The last thing I can think to report is that there still does seem to be something up with moving the raiders and slaves around between settlements. They still don't seem to move at all. I am only able to find one radier in my slaver outpost, but it reports 11 people, some of which were slaves sent from a few places. I thought there were several radiers here, but maybe they were sent on the raid? I'm not sure how Jammer grabs his people; specifically, if he grabs some of them from other settlements.
Very excited to see this progress! Finally picked up a couple slaves! Thanks
@kinggath.