MyST: role on directive header (for example {fa}) breaks dropdawn directive

[Arhorn]

Describe the problem

Link to your repository or website

No response

Steps to reproduce

Use MyST-parser

1. create .md file
2. Copy-paste example from panels docs
3. fix syntax bug
4. make html

The version of Python you're using

3.9.6

Your operating system

windows 10

Versions of your packages

Additional context

No response

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[chrisjsewell]

Heya see #67, best to try that out