Custom classes Row, not working

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If I edit a row I can add a custom CSS classes. When adding a class and save it it says it succesfully saved the layeout. But when checking the form (or try to edit the class again) it does not shows me the custom class.

Type: Ticket
Status: New
studio4graphics
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concrete5 Environment Information

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Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36

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