Markdown preview fails to render Mermaid in VS Code 1.121.0 when using mermaid-chart extension (v2.6.6)

[syuuha]

[Description]:

After upgrading to VS Code 1.121.0, Mermaid diagrams in Markdown files are not displayed in the preview panel.
However, I noticed that if I edit the Markdown source code (e.g., type any character inside the code block), the Mermaid preview suddenly renders correctly.

Without mermaidchart.vscode-mermaid-chart extension installed, everything works correctly.

[Steps to reproduce]:

1. Install VS Code 1.121.0
2. Install the extension mermaidchart.vscode-mermaid-chart v2.6.6
3. Create a Markdown file with two Mermaid diagram code block
4. Open the Markdown preview
5. Observe that the Mermaid diagram is not rendered
6. Type any character inside the Mermaid code block in the source editor
7. Observe that the preview now shows the diagram correctly

[Expected behavior]:
The Mermaid diagram should render immediately without needing to modify the source code.

[Screenshots]:

Initial broken preview

Preview after typing in source code

[Environment]:
VS Code version: 1.121.0
Extension: mermaidchart.vscode-mermaid-chart (v2.6.6)

[Note]:
VS Code 1.121.0 introduced a built-in extension called "Mermaid Markdown Features" that adds native Mermaid support. This may be causing a conflict with the third-party Mermaid extension.

[takashiK]

mermaid chart conflict vscode native render for mermaid. it support from v1.121.0

[charles-cai]

For now i have to uninstall Mermaid Chart extension :(