REST API endpoint /rest/api/2/project/{projectIdOrKey}/properties is not finding projects by projectId

Summary

The REST API endpoint /rest/api/2/project/{projectIdOrKey}/properties is not finding projects by projectId, caused by a change on the regex for project ID, when it allows only numbers on the project key, the /project/<ProjectID>/properties API will not work with project ID, only with the project key.

Steps to reproduce

1. Change the application property jira.projectkey.pattern to accept only numbers as a project key (ie: ([A-Z_0-9][A-Z_0-9]+)).
2. Call the API https://<instance>/rest/api/2/project/<ProjectID>/properties using any project.

Expected Behaviour

The project key property values, even if it is empty.

Actual Results

{"errorMessages":["The specified Project does not exist in the system."],"errors":{}}

Notes

• When using the project key, the API is able to find the projects.
• The main concern with this API is that it is used by the add-on Tempo Timesheets to get data and it is not working due to this bug.

Workaround:

• Please make sure to revert the changes made to the jira.projectkey.pattern under Jira administration > System > General configuration and Advanced settings.

It should be ([A-Z][A-Z0-9]+)

• Make sure to not have alphanumeric project keys existing in your instance.