indent rule not working on .svelte files?

[aradalvand]

The following .eslintrc.cjs (created by npm create svelte@latest, I just added a rules section):

module.exports = {
	root: true,
	parser: '@typescript-eslint/parser',
	extends: ['eslint:recommended', 'plugin:@typescript-eslint/recommended'],
	plugins: ['svelte3', '@typescript-eslint'],
	ignorePatterns: ['*.cjs'],
	overrides: [{ files: ['*.svelte'], processor: 'svelte3/svelte3' }],
	settings: {
		'svelte3/typescript': () => require('typescript')
	},
	parserOptions: {
		sourceType: 'module',
		ecmaVersion: 2020
	},
	env: {
		browser: true,
		es2017: true,
		node: true
	},
	rules: {
		quotes: ["error", "single"],
		indent: ["error", "tab"]
	},
};

When I run npx eslint --fix MyComponent.svelte, the indent rule isn't applied, if the file is using spaces as indentation I expect ESLint to convert those into tabs, it does that for .ts/.js files but not for .svelte files.
Other rules like the quotes rule ARE applied in .svelte files as well; so this problem must be specific to indent probably.

Any ideas?