Issue in OJ's answer and "Run Code"

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    If I use this input [1,3] and click on run code I get [1,null,3] from leetcode while if I submit solution, it gives the correct answer as just [3,1]

    Based on the run code solution I assumed that I must create a new node whose value is Null to make a balanced tree. However, I get a wrong answer as the expected answer by the judge is just [3,1]

    I am using python. If I do not add a new node with Null/None value to fill in to make it balanced my answer gets accepted.

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