Workfront report filter

I am working on a Workfront report that groups projects by lifecycle stages (Analysis, Requirements and Planning, Implementation Phase, and Release).

Currently, the report filter uses the following criteria:

• Task Name contains "Analysis"

• Task Name contains "Requirements and Planning"

• Task Name contains "Implementation Phase"

• Task Name contains "Release"

The issue is that some parent tasks that are not actual lifecycle stage tasks are being included because their names contain one of these keywords.

ex: Delay Implementation -- it is not lifecycle stage, I need the starting should be filtered.

ex: Implementation Phase | Started -- It is lifecycle stage.

I attempted to change the filter from cicontains to operators such as beginswith and startswith, but Workfront returns an "Invalid Parameter" error for both modifiers.

Is there a supported way in Workfront reporting to filter tasks whose names start with specific values, or is there a better approach to ensure only the actual lifecycle stage parent tasks are included in the report?

Any recommendations or best practices would be appreciated.