🇺🇸United States @corriepotter

Looks like this was fixed but the composer install code still needs to be updated
https://git.drupalcode.org/project/twig_typography/-/commit/151cee38e332...

@Kaustab_Roy
I think that I found how to reproduce this.

Using the following code you will get the core key
composer require 'drupal/twig_typography:^2.1'

Using the following code you don't and everything works as expected.
composer require 'drupal/twig_typography'

ORIGINAL CAUSING EXCEPTION
twig_typography/twig_typography.info.yml

name: Twig Typography
type: module
description: Provides a twig filter to apply the PHP Typography library
core: 8.x
core_version_requirement: ^8.6 || ^9
package: Other

# Information added by Drupal.org packaging script on 2022-04-27
version: '2.1.0'
project: 'twig_typography'
datestamp: 1651047442

MODIFIED CODE FIXES EXCEPTION
twig_typography/twig_typography.info.yml

name: Twig Typography
type: module
description: Provides a twig filter to apply the PHP Typography library
core_version_requirement: ^8.7.7 || ^9
package: Other

# Information added by Drupal.org packaging script on 2022-04-27
version: '2.1.0'
project: 'twig_typography'
datestamp: 1651047442

corriepotter → created an issue.