treegrid root node icon missing sometimes

If I add two rows to the treegrid and then move the second row to be a child of the first row, the ± icon for the first row shows the red missing icon [x]. If I add another row to the grid, the icon for the first row now properly appears as a [-].



Where can I find the icon that is missing?



I am using 90226.



Best regards,

Gyle

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