Deactivation arrow in sequence diagram is getting error when participant has first letter x

[andreas-ajaib]

Describe the bug
I am not sure if it's live editor bug or the mermaid itself.
When the participant starting with letter x, the deactivation arrow ->>- is throwing error Error: parse error on line

To Reproduce

sequenceDiagram
    xen->>+pay: callback
    pay->>pay: acquire lock
    pay->>-xen: respomd

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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