Do joint owner bonds go through probate when one dies without a Will?

Question Details: My mom and sister owned EE bonds together. The statues of ownership is (or). With mom as the first. However mom died without a signed will. She owned a house in her own name. I have zero interest in the bonds. We are spliting the estate. Does sis need to list them in the inventory for probate or is it safe to say she is free and clear as the owner of the bonds without the process of probate?

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