Typescript interface doesn't show any methods in VScode popup (on hover or on ctrl-k-i)

Question

interface SomeInterface {
    someMethod: string
}

let test: SomeInterface = {
    
};

When I create any interface in VScode, there is no preview of any methods within the interface.

Extra information:

When I use a type declaration, it works as expected.
I am aware of (and agree with) the behavior described here, however, this does not seem to work for me.

Things I've tried

Create a jsdoc description above the method (did not display the description or the method).

Current workarounds

hold alt to preview full declaration (this is not ideal because it does not work with the ctrl-k-i hotkey that displays the popup without having to use the mouse).
ctrl-space when constructing object to activate IntelliSense suggestions.
use peek to jump to the interface declaration.

Any explanation or fix would be great thanks!