Formula is 'subject', 'subtitle' content error

The system falls into error when the DOC NAME formula is used in ‘subject’, ‘subtitle’ content in the screenshots I have specified in the appendix.
I attached the original file and corrupted file. We are using Aspose.Word 20.11 version. Thanks.
YG13536.zip (893.7 KB)

@srmbimser

Could you please share some more detail about the issue that you are facing? Please also share the code example to reproduce this issue at our end. We will investigate the issue and provide you more information on it.