Save changes on Workflow-Step results in layout-broken landing-page

[MLindenhofer]

Hi,

CMS-Version: 4.12.0
Module-Version: 5.8.0

I'm exploring this great module for a project of ours. The whole layout breaks when:

• Save changes after editing a workflow-action OR
• Refresh & clean cache in the edit-interface of an action.

When hitting the one of the links in the broken layout, I get redirected to an url like this:

http://_mydomain.test/admin/workflows/Symbiote-AdvancedWorkflow-DataObjects-WorkflowDefinition/EditForm/field/Symbiote-AdvancedWorkflow-DataObjects-WorkflowDefinition/item/1/ItemEditForm/field/Workflow/action/item/1/Form/admin/workflows/Symbiote-AdvancedWorkflow-DataObjects-WorkflowDefinition/EditForm/field/Symbiote-AdvancedWorkflow-DataObjects

Screenshot of broken layout page:

Thanks in advance.