[Copilot Chat Bug] Multiple code blocks in single response - only last block renders

[nandurstudio]

🏷️ Discussion Type

Bug

💬 Feature/Topic Area

VS Code

Body

Description:

When Copilot Chat sends a response containing 3 or more code/terminal blocks, only the final code block renders in the chat interface. All previous code blocks disappear and are not visible to the user.

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Reproduction Steps:

1. Ask Copilot Chat to provide 3+ code or terminal blocks in a single response
2. Example: "Show me 4 terminal commands: 1) Check status, 2) List databases, 3) Test connection, 4) Show config"
3. Observe the chat display

Expected Behavior:
All 4 code blocks render and are visible in chat interface.

Actual Behavior:
Only code block 4 (final block) is visible. Code blocks 1, 2, 3 are hidden/missing.

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Workaround Discovered:

Copying the entire response to an external markdown file (.md) and opening the markdown preview in VSCode renders all code blocks correctly. This confirms the issue is specific to Copilot Chat's markdown renderer, not VSCode or the underlying markdown parser.

Steps to Workaround:

1. Select all in chat: Ctrl+A
2. Copy: Ctrl+C
3. Create file: response.md
4. Paste: Ctrl+V
5. Open preview: Ctrl+Shift+V
6. Result: All code blocks visible in preview ✅

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Environment:

• GitHub Copilot Chat: Latest version
• VSCode: Latest version
• OS: Windows 10/11
• Extension: GitHub.copilot-chat (v0.42.2 or latest)

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Reproduction Evidence:

Test case: 4 terminal blocks

• Block 1: PowerShell command
• Block 2: Bash command
• Block 3: PowerShell script
• Block 4: Bash script

Result in chat: Only Block 4 visible

Result in .md preview: All 4 blocks visible ✅

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Additional Notes:

This affects user experience significantly when multiple commands/code snippets need to be executed in sequence. Users may not realize blocks are missing unless they copy-paste to external file.

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