Underline leaves behind blue text upon removal

Blue text is present where underline annotation used to exist.

SO: Windows 10
Java version: RedHat OpenJDK 11.0.10
GroupDocs.Conversion version: 21.7.2
sample.docx (12.6 KB)
result-text-underline.docx (13.5 KB)
result-removed-annotation.docx (10.6 KB)

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