[BUG] Slow response times with sso login - 1.0.56+

Environment

• Platform (select one):
• [x] AWS Bedrock
• Claude CLI version: 1.0.56 +
• Operating System: Linux
• Terminal: bash

Bug Description

After going through the SSO login flow and launching Claude Code, the prompt takes between 5-20 minutes to generate a response. This is only through SSO login, using access keys results in normal response wait times.

Steps to Reproduce

1. Install claude code version 1.0.56, 1.0.57, or 1.0.58 (currently, the three latest versions after 1.0.55)
2. Login via aws sso login --profile=one-of-the-profiles-set-in-configuration
3. Start claude, give first prompt
4. Observe wait time

Expected Behavior

1. Wait times expected at less than 10s for a simple "hello" prompt

Actual Behavior

1. Wait times for the response were 5-20 minutes