I may have found a new bug. With luck I have some old saves to load to confirm. The issue seems that when Preston Garvey (and possibly any companion) is assigned to a plot they lose the ability to gain affinity.
I assigned Preston Garvey to a martial plot in Sanctuary and had Codsworth as my companion. I began the dialog with Mama Murphy and convinced her to give up chems. This normally triggers an affinity boost for Preston but did not. Codsworth loves it but I did not receive any message about Preston.
I also noticed the normal affinity boosts for improving weapons did not register.
If the save is there, I will unassigned Preston and do the event again. If they both love the action then issue is with having companions assigned. An easy work around will be to unassign the particular companion , mod the weapon (or whatever) and reassign them.
I assigned Preston Garvey to a martial plot in Sanctuary and had Codsworth as my companion. I began the dialog with Mama Murphy and convinced her to give up chems. This normally triggers an affinity boost for Preston but did not. Codsworth loves it but I did not receive any message about Preston.
I also noticed the normal affinity boosts for improving weapons did not register.
If the save is there, I will unassigned Preston and do the event again. If they both love the action then issue is with having companions assigned. An easy work around will be to unassign the particular companion , mod the weapon (or whatever) and reassign them.