pandoc-3.10.1: test/command/7920.md

```
% pandoc -t native
[hi]{#123}
^D
[ Para [ Span ( "123" , [] , [] ) [ Str "hi" ] ] ]
```

```
% pandoc -t markdown
[hi]{#123}
^D
[hi]{#123}
```

```
% pandoc -t markdown
# Hi {#123}
^D
# Hi {#123}
```