Configuring theme>colors>primary causes the color value to be the only primary color.

[Marvin]

Configuring theme>colors>primary causes the color value to be the only primary color.
This is the configuration of tailwind.config.ts that I changed once

/** @type {import('tailwindcss').Config} */
import type { Config } from 'tailwindcss';
import { iconsPlugin, getIconCollections } from '@egoist/tailwindcss-icons';

export default <Partial<Config>>{
  darkMode: 'class',
  theme: {
    colors: {
      primary: '#d81e06'
    }
  },
  plugins: [
    iconsPlugin({
      // Select the icon collections you want to use
      collections: getIconCollections(['mdi', 'heroicons'])
    })
  ]
};

I added the original property, or I removed the primary and removed all the dependencies, reintroduced, and then restarted with only one primary color value and no other colors.

/** @type {import('tailwindcss').Config} */
import defaultTheme from 'tailwindcss/defaultTheme';
import type { Config } from 'tailwindcss';
import { iconsPlugin, getIconCollections } from '@egoist/tailwindcss-icons';

export default <Partial<Config>>{
  darkMode: 'class',
  theme: {
    colors: {
      primary: '#d81e06',
      ...defaultTheme.colors
    }
  },
  plugins: [
    iconsPlugin({
      // Select the icon collections you want to use
      collections: getIconCollections(['mdi', 'heroicons'])
    })
  ]
};

[Marvin]

This is a minimal implementation that runs directly after the dependency is installed.
Then unwrap the comment section and run it again. The effect is the same.

Duplicate address code

[Inesh Bose]

Yes, this is desired behaviour. Please refer the docs - https://tailwindcss.com/docs/customizing-colors#using-custom-colors

Updating colors: {} means replacing the default color palette.

If you want continue using default colors, please make use of tailwindcss/colors; read https://tailwindcss.com/docs/customizing-colors#using-the-default-colors.

Your file contents will rather be:

/** @type {import('tailwindcss').Config} */
import type { Config } from 'tailwindcss';
import * as colors from 'tailwindcss/colors';

export default <Partial<Config>>{
  darkMode: 'class',
  theme: {
    colors: {
      primary: '#d81e06',
      ...colors,
    },
  },
};