We have reviewed the provided DWG file. Both in DWG FastView and AutoCAD, the string does not appear. We converted the file to DXF using AutoCAD and reviewed its content manually. The file doesn’t contain string beginning with “4号” - such as the missing string, while it does contain string beginning with “3号” - such as the present string next to it.
Furthermore, while Aspose.CAD indeed does not support .SHX fonts, it will render all text using a different available font automatically. And even if the font won’t support the characters in the text, they will at least appear as squares. However, any font would contain symbols for digits, so at least they would be displayed correctly. While in this case, nothing appears at all.
As such, we are strongly convinced that the provided file indeed doesn’t contain the string at all and is different from file where the string can be seen.