Trigger failing with post function

[Tina Cumpston]

I currently have a transition in workflow for a story from "Assigned" to "In Progress". The user has the ability to manually START the story to process to "In Progress" or if a branch is created in Bitbucket, the story is started automatically. I am trying to add post function to this process to add Due Date, Assignee, and Sprint. This is working fine when manually starting the ticket....but the trigger is failing when I create a branch. The status is not updated and no fields are updated. I am aware that Conditions, Validators and permissions will be ignored for automatic transitions. I don't see anything for Post-Functions.