I think what went wrong is that time progressed while I was viewing the cutscene, and then Edna's shift at the Goods Store ended and she was replaced by another villager (Jed Scrumpy) . When the cutscene ended the target character was changed and Edna's dialogue was given to Jed (her portrait was replaced with his) and then it crashed : (
Version: 1.1.0.11731
Cause: Target character changed mid cutscene / on autosave exiting a cutscene
Repro: N/A