Bionic 1.0.2: Reasoning mode causes ngPredictTokens HTTP 400

[smerght-ops]

Title: Bionic 1.0.2 - Reasoning mode causes ngPredictTokens HTTP 400

Environment:

• Bionic: 1.0.2 (build 3)
• OS: Windows 11 Pro 64-bit
• GPU: NVIDIA GeForce RTX 3090 Ti 24 GB
• Backend: LM Studio / LMS Core

Problem:
When Reasoning is enabled in Bionic, even the simplest prompt such as "Hello"
fails with the following error:

Engine protocol ngPredictTokens request returned 400:
{"error":{"code":400,"message":"Assistant message must contain either 'content' or 'tool_calls'!","type":"invalid_request_error"}}

Reproduction:

1. Start Bionic.
2. Select Qwen3.5 35B A3B.
3. Enable Reasoning.
4. Start a new conversation.
5. Send: Hello
6. Request fails with HTTP 400.

The same failure was reproduced with:

• Qwen3.5 35B A3B
• Mistral Nemo Instruct 2407

Control test:
Disable Reasoning and start a new conversation.
The same Qwen3.5 model works normally.

Voice transcription with the local Voxtral model also works correctly when
Reasoning is disabled.

Relevant Bionic log:
[LMSInternal][LMSAuthenticator][Client=LM Studio]
[Endpoint=appendUserDraftAndRunUntilWaiting]
Error in RPC handler:
Engine protocol ngPredictTokens request returned 400:
"Assistant message must contain either 'content' or 'tool_calls'!"

Observed:
Reasoning ON -> HTTP 400
Reasoning OFF -> works normally

Expected:
Reasoning mode should send a valid assistant message containing content
and/or tool_calls and should not cause the request to fail.

The issue appears independent of the selected LLM and reproducible specifically
when Bionic Reasoning mode is enabled.

[garyexplains]

I am seeing this same error a lot. So much that now Bionic is unusable. It seemed to start for me after the context for a long session was compacted. Unlike the original poster, I can't get the message to disappear. Thinking on or off, different models, different sessions. I hit this problem very quickly. Sometimes I get one or two interactions and then the error.

[russ-andersson-borisfx]

I see these messages frequently any time I try to do an extended session. Quit bionic and ollama and restart the session and you're likely to keep seeing it. Turning off reasoning did not help.