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There could be several reasons why nested child elements are not visible when using JSON column formatting in Microsoft List in SharePoint Online, including:

1. Incorrect JSON syntax: Make sure that the JSON syntax is correct and that all opening and closing brackets are matched properly.

2. Incorrect mapping of child elements: Check that the child elements are correctly mapped to their parent elements in the JSON formatting code.

3. Incorrect use of conditional formatting: If conditional formatting is used, make sure that the logic is correct and that it includes the nested child elements.

4. Missing data: Check that all the necessary data for the child elements is present in the list, otherwise they may not appear in the JSON formatting.

5. Data set too large: If the data set is too large, the nested child elements may not be displayed. Consider breaking the data into smaller chunks or using pagination to display the data.