Sometimes the submit button doesn't go grey when it should (i.e., when there's no value in the input bar). I have no idea why this is happening; it seems that it can potentially happen to any field_type, as refreshing the page repeatedly brings up different results.
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Had some time to take a closer look at this, and what's happening is that sometimes missingFieldValue is acquiring a value.
I'm not sure why this is happening, but I was able to solve the problem by manually setting its value to null in skiptoNext()