Changelog category (leave one):

• Bug Fix (user-visible misbehavior in official stable or prestable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

...

Bug fix for make_list_with_nulls:
input query: Customers | summarize t = make_list_with_nulls(Age) by FirstName
output:
┌─FirstName─┬─t─────────────────────────┐

│ bbb │ [20,10,NULL,NULL] │
│ ccc │ [3,1,2,NULL,NULL,NULL] │
│ aaa │ [200,100,200,300,300,100] │
└───────────┴───────────────────────────┘

Note: please use non-string columns because KQL doesn't support NULL for string datatype.
Also, the order of NULL is not defined because If the input to the summarize operator is not sorted, the order of elements in the resulting array is undefined.

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