why interface to Record<string, string> get an error, but use type is normal?

[WormGirl]

Bug Report

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🕗 Version & Regression Information

• This is a crash at offical playground.

⏯ Playground Link

Playground link with relevant code

💻 Code

interface Menus {
  systemCode: string;
  systemName: string;
  systemId: string;
};
const b: Array<Menus> = [
  {
    systemCode: 'string',
    systemName: 'string',
    systemId: 'string'
  }
];
let a: Record<string, string>[] = [];
// this get error
a = b;

type Menus = {
  systemCode: string;
  systemName: string;
  systemId: string;
};
const b: Array<Menus> = [
  {
    systemCode: 'string',
    systemName: 'string',
    systemId: 'string'
  }
];
let a: Record<string, string>[] = [];
// this work fine, why ?
a = b;

🙁 Actual behavior

🙂 Expected behavior

[MartinJohns]

You forgot to fill out the issue template. Duplicate of #42825.

[RyanCavanaugh]

It looks like this is a question rather than a bug report. This issue tracker is for tracking bugs and active work on TypeScript itself, rather than a general forum for programmers using TypeScript to get help or ask questions.

You can ask questions on sites like Stack Overflow. We are not able to provide one-on-one support on the issue tracker. Please read the issue template carefully - it has important information on what kinds of reports can be acted on here, as well as links to useful TypeScript resources. Thanks!