Cannot compile \p{gc=Unassigned}

[nihei9]

maleeni v0.6.0 cannot compile \p{gc=Unassigned}. Specifically, I made the following file:

{
    "name": "test",
    "entries": [
        {
            "kind": "unassigned",
            "pattern": "\\p{gc=Unassigned}"
        }
    ]
}

Then I got the following error:

$ maleeni compile test.json
failed to compile in default mode: surrogate code points U+D800..U+DFFF are not allowed in UTF-8: U+D801..U+DB7E

Regardless of whether gc=Unassigned properties are practical or not, the expectation is that no errors will occur.