Saving array into array

Hello, when saving an array of integers into a field in CDT array, I am seeing that the first value of the integer array is getting repeated, rather than the array being saved element-by-element.

For example if I print testcdt.id after executing a!save(testcdt.id,{1,2}) I am seeing {1,1} as the values in testcdt.id rather than {1,2}. Am I overlooking something, or is there a problem with my environment? Using Appian 16.3.

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