The Jira field 'Category' with field type 'Category' is always on 'CLOSED'.
I am talking about this field:

When I try to edit this field, I receive the following message:
"This field was created by Jira or one of its plugins, and can't be edited"
As you can see below:

Now, as you can see in the screenshot above, there is a link 'Edit options'. And in the past I was able to define some values for the category. But this option is completely gone. Below you can find the category values I was able to setup. Now I want to change them, but I can't. Any ideas how I can still edit them?
