Open List Item Panel - No JSON Formatting if Column Hidden in List View
If a list column has custom JSON formatting, and the column is hidden in the list view, the JSON formatting is not applied when the item is viewed in the Open item panel (i.e. when double-clicking on the item).
The column is formatted correctly in the Properties panel and in the DispForm.aspx page.
Please add the JSON formatting to the Open item panel even if the column is hidden in the list view.