LabVIEW Unit Test Framework: Test Vectors cause VI output to always be 0?

[JKSH]

Hello, I'm trying out the Unit Test Framework. I'm struggling to make Test Vectors work correctly.

My unit test simply involves 1 VI that takes 2 numeric inputs and outputs their average.

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When I manually set up every single test case and don't use Test Vectors, I get the expected results:

Manually entering every test case: The VI's outputs correctly reflect the inputs

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However, when I apply the same inputs using Test Vectors, my VI always outputs 0 no matter what the inputs are:

Using test vectors: The VI's outputs are always 0

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What's going on? (Test files attached -- LabVIEW 2020)