Replace Text fail second time in docx document

When I do a first replace text in a DOCX it works, but if I try to do another replace to the same document a lib internal NullPointer blows up. I made tests with the Spring Demo Application and Java Sample Examples.

Git project: GitHub - groupdocs-total/GroupDocs.Total-for-Java: GroupDocs.Total Java Examples
Git branch: main
Git revision: 7222ea0f
Browser: Chrome Version 92.0.4515.159 (Official Build) (64-bit)
SO: Windows 10
Java version: 1.8.0_281
Exemple file: AddTextReplacementAnnotation0.docx (14.2 KB)

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