Space label/category is not shown in UI when set via API

When label is set to space via API, it is set correctly, but not shown in the UI. This makes it impossible to remove label from space using other than remote API.

As a clarification:

• The labels set via UI are shown correctly.
• Labels set via UI and/or API affect on dynamic listing correctly
• Label can be set and remote via API
• The issue is only in showing them in UI

Related discussions:

• https://answers.atlassian.com/questions/324332/space-labelcategory-is-not-shown-in-ui-when-set-via-api
• https://answers.atlassian.com/questions/212369/how-to-remove-space-label-set-via-remote-api