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GroupDocs.Annotation throws exception when inserting watermark annotation using .NET 6.0

GroupDocs.Annotation throws exception when inserting watermark annotation using .NET 6.0. You can use any PDF file to reproduce this issue.

https://gist.github.com/groupdocs-com-kb/f5b515d1ea496713e465c1dc650b2a1e#file-how-to-add-watermark-annotation-to-pdf-using-c-cs

I am using the above code example in following topic:

We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.

Issue ID(s): ANNOTATIONNET-2183

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