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I think this is an issue related to a change we made regarding how defining controls in the interact decorator works. I've opened an issue about that behavior here: https://github.com/sagemath/sagecell/issues/353

In the meantime, since t is being defined in the function globals, you can access it from there (or just by the variable t). One thing you might want to do for now to ensure consistent behavior with local variables and kwargs for the function is to either define all interacted variables in the interact decorator or define all interacted variables in the function itself until the issue is resolved.