Hiding a rich text field

Hiding a rich text field with a formula “Hide paragraph if formula is true” does not work as with other fields.
In fact the contents of rich text field can retain the same property “Hide paragraph if formula is true” when it is saved even if this property was modified with a notes client designer.
This situation occurs when the rich text field is the first element of a row or a cell of a table.
To set the new property for a rich text field, type a space or other element before the rich text field.