[Bug] v1.13.0: composer package-type "metapackage" conflicts with PackageJsonSynchronizer

[possi]

Steps to reproduce:

• composer global require "symfony/flex"
• echo '{}' > package.json
• composer require "gaufrette/ftp-adapter"

Output:

  [ErrorException]
  file_get_contents(/home/starke/flex-test/vendor/gaufrette/ftp-adapter/composer.json): failed to open stream: No such file or directory

Composer version 2.0.13 2021-04-27 13:11:08
symfony/flex v1.13.0

This does not occur with v1.12.2

Assumed Explanation:
The package-type doesn't "write anything to the filesystem". Therefore the composer.json can not be read, as it isn't present.

[stof]

There is some discussion about it on the commit itself (though this issue is a better place): 8798024#r50964641

[possi]

@stof I second using installed.json/api
There may be other plugins for different package types (typo3, magento, etc.) which move the package installation directory or changes its directory structure.

[stephanvierkant]

Same issue with minishlink/web-push-bundle (type: symfony-bundle)