Parameter inlay hint is incorrect when function has a this type

[yume-chan]

🔎 Search Terms

inlay hint this

🕗 Version & Regression Information

• I was unable to test this on prior versions because it requires changing TypeScript version in Visual Studio Code

⏯ Playground Link

https://www.typescriptlang.org/play/?#code/CYUwxgNghgTiAEAzArgOzAFwJYHtVNQAoAoeeMKCCAIyjAGsAueQqZ1ZAW2pBgBp41ZgGcMMLKgDmASngBeAHzwAbjizBi05qvUBuYsUREU6bHhYYAFlmHsuPfvCgDqsgN7wAvtP1A

💻 Code

declare function fn(
  callback: (a: number, b: string) => void
): void;

fn(function (this: number, a, b) { });

🙁 Actual behavior

Inlay hint on parameter a shows :string, but it's actually a number:

And inlay hint for b is missing

🙂 Expected behavior

Should display a: number, b: string

Additional information about the issue

No response