A contributed module without an issue tracker on Drupal.org?
It seems that within the edit section of any project page (which is available to e.g. the project maintainer), inside the Issues tab, there is a checkbox with label Enable issue tracker.

By default, this checkbox is enabled. But if you disable it, the block (column right) with title "Issues for moduleX" is not shown anymore.

And if you re-enable that checkbox again, the block is also shown again ... And the issues that existed before the block is disabled, seem to still exist. So unchecking that checkbox does not delete all existing issues (as it should be I think).