Packagist stats not displayed in "Downloads by month"

Summary

The downloads statistics for packagist are not displayed for some extensions.

Example URL

https://extensions.typo3.org/extension/schema/

What is the current bug behavior?

Only TER and extension manager downloads are displayed.

What is the expected correct behavior?

Acceptence Criterias

• The statistics for packagist are displayed as well.

Possible fixes

Seems it occurs because my version tags start "v", e.g. "v1.9.0".