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BP_Sky_Sphere not respecting Refresh Material and Update Sun Direction for day/night cycle

I feel like I’m going crazy here. I have implemented a day/night cycle with the following setup:

  • Added directional light. Set mobility to “Movable”

  • Added BP_Sky_Sphere. Set Directional Light Actor to be the previously created directional light

  • In level blueprint, used Event Tick to add to the directional light’s yaw, then set BP_SkySphere to Refresh Material and called Update Sun Direction

I confirmed my directional light is rotating but the sun position never does. I feel like I’m missing something very obvious and it’s incredibly frustrating. Can anyone see anything wrong with this setup?

Also, in the level blueprint, “TimeScale” is 30.

If I manually rotate the directional light and hit “Refresh Material” on the sky sphere, it updates fine. I have no idea why it doesn’t work in the blueprint.

I seem to be having issues linking to my screenshot, here it is: https://i.imgur.com/Pou8WmW.png