Dependencies added in a patch applied by composer are not installed

I opened an issue:

The error received initially was:

[InvalidArgumentException] Package is not installed: drupal/config_sync-dev-2.x

That error came shortly after in the sequence:

Gathering patches for root package.  
Removing package drupal/config_sync so that it can be re-installed and re-patched.  
  - Removing drupal/config_sync (dev-2.x)  
Deleting web/modules/contrib/config_sync - deleted

This issue seemed relevant…

After the initial error, i could run composer update and composer update --with-dependencies without errors… but without installing config_normalizer either.

Pretty sure the error is separate from this issue.