The paste dialog (ctrl-shift-v) seems to be treating long strings that are similar as duplicates. For example the string
/// <remarks>This method should be used for types that are arrays and therefore require a size to be specified.
/// These types are <see cref="RandomType.String"/> and <see cref="RandomType.Binary"/>.</remarks>
and the string
/// <remarks>This method should be used for types that are not arrays and therefore do not require a size to be
/// specified.</remarks>
are being treated as if they are duplicates, so one of these strings replaces the other in the paste menu.