I am using Drupal 9.0.3 and I Faced this issue after updating the composer to...

I am using Drupal 9.0.3 and I Faced this issue after updating the composer to '1.10.11'.

Rolled back composer version as per #7 and the issue went away.

@jonathan1055 Even I was doing composer require drupal/coder right after updating the composer version. So after reading your comment, I tried composer require for other modules - But the issue remained on composer version `1.10.11`. I agree it looks like a Non-Drupal issue.