In the end, a post object field is just a select field. In a select field each choice is only represented once and this means that each can only be selected once. In order to select the same thing multiple times it would need to exist as an option in the select field multiple times. There aren’t any ACF fields that will do this without using a repeater. This has nothing to do with the JS and has to do with the limitations of the underlying select field.
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