This is a problem with the way some trees (like StarterGui) are cloned when the game starts. Fixing this problem is quite involved, and is not super easy on the engine side. We are looking into it but don’t have a timeline at the moment. For now the recommendation is to have actions and guis in the same tree, or hook up the UIBindings at runtime, referencing the PlayerGui rather than StarterGui. Sorry about the inconvenience!
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