Bug: AnthropicAPI: `API Error: Content block not found` when `CLAUDE_CODE_DISABLE_NONSTREAMING_FALLBACK=1` using claude-code

[hksdpc255]

What happened?

Name and Version

version: 4363 (78977c0)
built with clang version 21.1.8 (https://github.com/conda-forge/clangdev-feedstock b2067a0584542d4f2770958e69d0fac7c9ebf156) for x86_64-conda-linux-gnu

What operating system are you seeing the problem on?

No response

Relevant log output

[hksdpc255]

Non-streaming API works fine with claude-code.

Maybe the content block is not send when the model decide to only think and call tools?

Mainline llama.cpp works.