DOCX Validation reporting 0 errors on invalid document
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Description
[x] Issue with the OpenXml library
**Description**
Invalid DOCX document that cannot be opened with Microsoft Word 2019 is reported as valid by Open XML SDK Validator.
**Information**
- .NET Target: .NET Framework 4.7.2
- DocumentFormat.OpenXml Version: 2.9.1
**Repro**
Create a new valid DOCX document containing table and remove child element from parent.

Validation will report 0 errors, while Microsoft Word would report error:

I'm attaching such corrupted document.
[word.docx](https://github.com/OfficeDev/Open-XML-SDK/files/3160367/word.docx)
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