Problem Statement/Rationale

When I used the import tool to import a json file. in some fields the import automatically adds multiple nulls as values to the fields that did not exist in the original file, and adds the actual data in another nested array. 

Please be sure to attach relevant logs with any sensitive data redacted.

Steps to Reproduce

It seems that this happens when the name if the field contains a number, example:

 
"PCIDSS v3.2": ["12.1","12.1.1"],

Expected Results

expected document in database:
PCIDSS v3: Array
0: "12.1"
1: "12.1.1"

Actual Results

 
PCIDSS v3: Array
0: null
1: null
2: Array
    0: "12.1"
    1: "12.1.1"

Additional Notes

I removed the number from the field name and the nulls / nested array went away. Another example in screenshots.