Salesforce Action Plan next task not opening when previous task is completed via Apex trigger (before insert)

Hello Everyone, 

I’m working with 

Salesforce Action Plans where tasks are created automatically from an Action Plan Template when a Case is created.

I have a requirement to auto-complete the first task (based on some condition like Subject contains 'AUTO') so that the next dependent task opens automatically

. 

What I observed:

1. Before Insert Trigger

• I set Status = 'Completed' in a before insert trigger
• Task gets created as completed (IsClosed = true)
• ❌ Next task does NOT open

2. After Insert Trigger (Synchronous Update)

• I updated the task to Completed in after insert
• Status updated correctly
•  ✅ Next task opens correctly

3. Queueable Apex (Async Update) in Before Insert Trigger

• When I moved the completion logic to a Queueable class
• Task is first created, then updated asynchronously
• ✅ Next task opens correctly

 I would like to keep this in before insert only. 

Please add your thoughts , solution.