Unofficial Fallout 4 Patch

Mods installed: Unofficial Patch
No Creation Club Content
Vanilla Quests completed: Up to MQ202 stage 10 to unlock Nick and the Brotherhood of Steel, spoke to Piper

Companion:
Nick Valentine

Description of crash:
Hard crash to desktop with grinding noise
It has happened three times. All at the same spot and during the same dialogue.

It appears to be happening just after Phase 6 of DLC03MQ02_0600_OldLongfellowEscort.

The player character has not explored Far Harbor other than to arrive and go through DLC03MQ02 to Stage 504.
Have spoken to the Mariner to start the first quest for her. It's the one that sends the player to Eagles Cove Tannery to fetch power tools. (I *think* it's DLC03FarHarborM02 but could be mistaken.)
Have picked up magazine next to Longfellow to unlock POI map markers.

Location of crash:
Wilderness cell: 12,7
Upon entering DefaultSetStageTrigger that sets stage 506.
X: 50704, Y: 32544, Z: 888
(I have no idea if it is this trigger or if something else is doing it.) This trigger is located almost center of a cell and something may be loading in a different cell that's doing it.

Additional Information:
I'm unsure which category to post this under. I do not know if it is a trigger, dialogue, AI package, or crossing over a cell border that is triggering the crash. I also do not know if it is because the character is fairly low-level (lvl 10, Int: 2 to slow down leveling).