Your description is that of a damaged EPUB (container)
Sigil (tidy) does not damage the container... It will always 'open'
Tidy may damage the contents of a poorly formed file within.
My definition of damage is not the same as some others here.
My definition is the words (text and images) no longer display (or display wrong) for a segment
Other define it as: 'You changed 1 byte of my code' (the document appears on devices correctly)
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