When importing and merging documents the fonts are extracted directly from the files and can duplicate if the files contain exactly the same fonts/subsets.
When concurrent accessing the FontsRepository`s RegisterFont (private)method from different threads an exception is thrown: System.IndexOutOfRangeException: 'Index was outside the bounds of the array.'
When rendering an encoded image for a second time the image data seems corrupted and an exception is thrown: InvalidOperationException: 'Illegal character.'
When getting the hash code of CFF (Compact Font Format) font`s UnderlineThickness and there is no such value set in the font file the default value should be returned but an exception is thrown: NullReferenceException: 'Object reference not set to an instance of an object.'
When exporting an image with ICCBased color space and the default ImageCompression is changed an exception is thrown: NotSupportedException: 'Not supported colorspace: ICCBased'.
NullReferenceException: 'Object reference not set to an instance of an object.' is thrown on export because the value of TransformMethod property is not obtained.