[Bug] Anthropic API Error: Cannot modify thinking blocks in assistant messages

Bug Description
API Error: 400 messages.1.content.27: thinking or redacted_thinking blocks in the latest assistant message cannot be modified. These blocks must remain as
they were in the original response.

Environment Info

• Platform: darwin
• Terminal: vscode
• Version: 2.1.153
• Feedback ID: 685ce8e1-5b2f-460f-99f9-f20d9dc1f4e0

Errors

[{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.27: `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_011CbVKrgzsCUzDC37GtYwQM\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63764)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T17:01:30.051Z"},{"error":"Error: 400 {\"type\":\"error\",\"error\":{\"type\":\"invalid_request_error\",\"message\":\"messages.1.content.27: `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_011CbVKtxaHn9JR4M4oXsanD\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:63764)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:51:7694)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-05-28T17:02:00.896Z"}]