(C#) file keyword/accessibility modifier isn't highlighted

[Arthri]

Describe the issue
The file accessibility modifier is left unhighlighted when applied to top-level types

Which language seems to have the issue?
C#

Are you using highlight or highlightAuto?
highlight

...

Sample Code to Reproduce

file class K {}
public class K {}

Highlight.js demo

Expected behavior
The file class keyword shares the same color as other accessibility modifiers such as public and private

Additional context
None