Is Index of recent saved documents reset to none at version upgrade?

When I go into LibreOffice documents, I am shown an index of recent docs I saved, latest first, as small page-image icons. Today a new Version of the LibreOffice suite was downloaded and auto applied when I went on. Is that why the index of recent saved docs was wiped clean and begun again?

should not be.
although a regular backup is recommended.
LibreOffice user profile - The Document Foundation Wiki

See also

Yes. I think there is a big report for it but I couldn’t find it. Also for Windows tdf#76131

What does Windows td#76131 mean? How can I look that up? thanks.

Click on the link to take you to the linked bug report. Just like any other link on the internet.