Select Options Don't Save in Block with Repeating Entries in 5.7

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I am working on a block that allows you to enter repeating items, as if you were creating a list.

I am trying to add a select options (drop-down) per item. It is not saving the data properly, and I can't find any info on how to do this.

The block is being developed in 5.7.4.2.

Does anyone know how to do this? Or is this a bug in 5.7.4.x?

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