Strange character in the top left of viewer page for Word documents

Good afternoon,

Some strange character appears when a word document is opened in the viewer with the htmlOption=true. I tested with mvn spring-boot:run and Tomcat server and issue happened for both.

Git project: GitHub - groupdocs-viewer/GroupDocs.Viewer-for-Java: GroupDocs.Viewer for Java examples, plugins and showcase
Git branch: master
Git revision: f75a0b7
SO: Windows 10
Java version: Redhat OpenJDK 11.0.10
Server: Tomcat 9.0.45
Files:
strange-symbol.png (28.4 KB)
docx-gd21.docx (12.5 KB)

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