[Bug] Anthropic API Error: 400 Bad Request on Extended Thinking

Bug Description
seeing this 400 on redacted thinking

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.154
• Feedback ID: 77a3121b-d9cc-49fe-a402-a380d9dace3b

Errors

[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.7.content.12: `thinking` or `redacted_thinking` blocks in the latest assistant message cannot be modified. These blocks must remain as they were in the original response.\"},\"request_id\":\"req_011CbVW8eD3iu3hrL2yzFPGo\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63816)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T19:16:14.631Z"}]