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 bug 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.

If you don’t wish to use links, you may go to the following address and enter the bug number 76131 there:
https://bugs.documentfoundation.org/