Help updating multiple values in multi select picklist field via Flow?

#Sales Cloud  #Flow  #Automation

My use case:

When a new Contact Role is added to an Opportunity, I want to update a multi-select picklist field (MSPF) on the Contact called "Role Type" 

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My Flow (that isn't working):

I built a record-triggered flow anytime a Opportunity Contact Role is created or updated that:

1. Gets the related Contact Roles from that Opportunity
2. Loops through the Contact Roles
3. Adds the Contact Role value from the Loop + a semicolon ( ; ) to a variable called New_Multi_Picklist_Value via an Assignment Resource (see screenshot below)
4. After the last item, update the Contact record:
   1. Update a "Test" text field on the Contact with the New_Multi_Picklist_Value variable values (I did this to make sure the flow was capturing multiple Role values)
   2. Updates the multi-select picklist field ("Role Type") on the Contact with the New_Multi_Picklist_Value variable values

^^^ I included a screenshot of the flow below.

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My problem:

The multi-select picklist field is ONLY updating with one Role value vs. the multiple Role values I want.

Ex: I tried adding Bob as two Contact Roles on a test Oppty:

1) One Contact Role w/ a value of Champion

2) One Contact Role w/ a value of Executive Sponsor

The MSPF would update to:

Executive sponsor vs. the expected value of Champion AND Executive Sponsor

Interestingly... the "Test" field would update as expected, to:

Champion;Executive Sponsor

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^^^ 

Can someone help me figure out how to ensure the flow updates my MSPF with multiple values, vs. just one?