According to the RTF specification: The valid values for the "\ls" index are from 1 to 2000.

They are currently exported from zero or "\ls0".

 An incorrect file is produced when merging a stream more than 40 times.

Workaround: A possible workaround could be to merge up to 40 times in one file, then continue merging in a new one, and finally merge the newly generated documents.

When exporting a document containing a FloatingImage in the header/footer the measurement of the header/footer height doesn't take into account the height of this image.

This leads to overlapping the page content with the image.

Workaround: Increase the Header (or Footer) top page margin by the height of the image:

foreach (Section section in this.document.Sections)
{
	double floatingImageHeight = 0;
	foreach (BlockBase block in section.Headers.Default.Blocks)
	{
		if (block is Paragraph paragraph)
		{
			FloatingImage floatingImage = (FloatingImage)paragraph.Inlines.FirstOrDefault(i => i is FloatingImage);
			floatingImageHeight = floatingImage.Image.Height;
		}
	}

	double left = section.PageMargins.Left;
	double top = section.PageMargins.Top + floatingImageHeight;
	double right = section.PageMargins.Right;
	double bottom = section.PageMargins.Bottom;
	section.PageMargins = new Telerik.Windows.Documents.Primitives.Padding(left, top, right, bottom);
}

When exporting to PDF a document containing Table merged into a TableCell an extra empty space below the inner table is added:

Add support for all number switches.  More info is available here: Formatting fields with switches

Here are the switches that should be supported:

Add support for Upper and Lower field switches  More info is available here: Formatting fields with switches

Here are the switches that should be supported:

When the data is set as double or float the Numeric formatting of the MergeField is not respected.

When the following merge field:

MERGEFIELD BAL  \# ###,0.00

is populated with 5.70F or 5.70D the result is 5.7 instead of 5.70.