The table preferred width value set to Auto or in percents is ignored and is always exported with fixed value.

Steps to reproduce:
Create a table with two columns in RadRichTextBox.
Set the table preferred width to auto.
Set the table cell preferred width for both columns to 50%.
Export to Docx format.

Observed result: the table has preferred width as fixed value 6.62 inches. The columns have the correct width.
Expected result: the table preferred width to be auto.