Warning: Trying to access array offset on value of type null in commerce_pricing_attributes_form_alter()

Getting this with PHP 7.4 too now, but only while deploying new projects, old websites do not produce this error.

Potential/similar fix maybe? https://www.drupal.org/project/drupal/issues/3314719 🐛 Notice: Trying to access array offset on value of type null in _field_write_instance() Needs review

Tried applying same logic from https://www.drupal.org/project/commerce_option/issues/3192150 → but no result.

I encountered the same error on a different line in the code and fixed it in the cited merge request.