[P0][CLI] Invoke fails with Internal server error in CLI but works in TUI

## Description
Invoke fails with Internal server error when running `agentcore dev --invoke "hello"` in CLI, but it is successful when using the TUI.

## Dev Notes
- Test deployed agent not just the dev mode
- Also check out streaming

## Category
Functional Bug

## Flow
Flow 1: Strands Memory Lifecycle

## Test Path
CLI

## Priority
P0

## Reporter
ajesstur