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

Bug Description
{"type":"error","error":{"type":"invalid_request_error","message":"messages.11.content.10: 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_011CXgvWx6tcZpQkHDhrd1GR"}

Environment Info

• Platform: darwin
• Terminal: iTerm.app
• Version: 2.1.29
• Feedback ID: b54386fb-3110-4585-959c-662d22aa77a2

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/[REDACTED]/.local/share/claude/versions/2.1.29 (expected in multi-process scenarios)\n    at BUR (/$bunfs/root/claude:3589:2098)\n    at SPA (/$bunfs/root/claude:3589:1209)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-01T07:05:02.549Z"}]