Agent instructions are not present in system prompt

[Vatavuk]

Agent instructions are not passed to LLM as a system prompt when using Gemini as BaseLlm. The instructions are visible in Llmrequest.getSystemInstructions but are not converted to Content and included in a query towards llm.

To Reproduce
Steps to reproduce the behavior:

LlmAgent.builder()
      .name("My agent")
      .description("some description")
      .model("gemini-2.0-flash")
      .instruction("You are a helpful agent for solving crimes. Always refer to me as Vatavuk")
      .build()

Send "Hi" to agent. Result will be something like "Hello! How can I help you today?"

Expected behavior
Agent should respond with something like: "Hello, Vatavuk! How can I assist you with your investigation or crime-solving needs today?"

Desktop:

• OS: [macOS]
• Java version: openjdk-24
• ADK version: 0.1.0

[TomorJM]

I ran this code, but the return value is correct.