When running any installer I've used over many years, before the actual install begins, I am presented a dialog with two check boxes. One the check boxes asks if I want for LibreOffice to start at login. The other asks if I want for an icon to be added to the desktop. It is always checked by default. But my answer is always "NO", so I un-check this check box. When I install any newer release in the future, the checkbox is still always checked by default. I would like for this checkbox to setting to be remembered and used as the default from the most-recent previous install. I know this is a very, very minor annoyance, but it would be nice just the same.
The checkboxes are from the package going to be installed, is not a setting already saved on computer configuration to be read by installation program. It is no way how to know if already some installed LibreOffice, and what have decided months/years ago. I don't think this is a bug.
The updating installed indeed reads the previously installed feature set - that e.g. allows to know which components needs updating. This request needs a dedicated (hidden) feature.