Issue Summary

On Jira Software 8.20.7 DC version:
When deleting an inactive project with an associated permission scheme, the permission scheme is detached from the project and the project is not deleted. And the Project Permission Scheme became None

This is reproducible on Data Center: (yes)

Steps to Reproduce

1. Step 1
   In Admin panel, go to Projects, and filter for those whose last issue update happened, for example, 2 years ago. If issues in those projects haven't been touched for so long, they are likely to remain inactive in the future. Try to delete this project
2. Step 2
   Check the permission scheme of the project from database

select * from nodeassociation where source_node_entity = 'Project' and source_node_id = <ID>
     
select * from permissionscheme where id in (select sink_node_id from nodeassociation where  source_node_id = <ID>)

And check the permission scheme is changing to None

Expected Results

The project is deleted successfully.

Actual Results

Project database information is corrupt. NODEASSOCIATION table for the “PermissionScheme” entity does not exist for this project. Could have happened by the incorrect removal of a project caused by an error or broken transaction while calling the method 
com.atlassian.jira.project.DefaultProjectManager.removeProject

Workaround

For workaround suggested steps in this Knowledge Base article: https://confluence.atlassian.com/jirakb/blank-page-displayed-when-loading-permission-scheme-configuration-in-jira-server-297670208.html can be followed.