An @ sign in a flowchart label breaks the parser

[KalebAxon]

Describe the bug

The following chart renders fine both in mermaid.live and here on GitHub, but it suddenly stopped working in mermaidchart.com. This has broken two charts of mine that worked fine a couple of days ago.

flowchart
    box["@box"]

To Reproduce

Try this chart on mermaidchart.com.

Expected behavior

Should work like it does on GitHub and on mermaid.live

Screenshots

Does not work on mermaidchart.com:

Works on mermaid.live:

Works on GitHub:

flowchart
    box["@box"]

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