Bug with Open XML SDK

[FankFerd1988]

Describe the bug
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Screenshots
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To Reproduce
// Please add a self-contained, minimum viable repro of the issue.
// If you require external resources, please provide a gist or GitHub repro
// An Xunit style test is preferred, but a console application would work too.

Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Observed behavior
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Expected behavior
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Desktop (please complete the following information):

• OS: [e.g. Windows]
• Office version [e.g. 16.0.15427.20178]
• .NET Target: (e.g. .NET Framework, .NET Core, UWP, Xamarin...)
• DocumentFormat.OpenXml Version: (e.g. 2.11.0)

Additional context
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[mikeebowen]

Closing this issue as it is just a copy of the issue template.