Recovering text in ODT files

If there’s a bug in LibreOffice, could it remove half of the text in a ODT file, DOCX file, or other text formats permanently or just not show part of it when I open it in LibreOffice only?

“If there’s a breakage in a car, could it loose half its fuel permanently or just not show part of it in its indicators?” (spoiler: it could be both.)

Or read the Guidline and ask a good question please. Which OS and LO version do you use? How do you go about what happens when?