If I save a PDF / UA, and the image has no alt text and / or has a blank space (because LibreOffice doesn't even let you indicate if an image is decorative), it turns the PDF into an image PDF, untagged, for me. without anything, removing all the texts. OpenOffice, on the other hand, does not have this problem even if it does not allow you to manage "decorative" images.
Please attach a sample file, and a screenshot with the options on the export dialogue.
(In reply to m.a.riosv from comment #1) > Please attach a sample file, and a screenshot with the options on the export > dialogue. I think this is a duplicate of Bug 138504 from November 2020. Note that marking an image or other non-text object as decorative requires a new attribute in the ODF specification; ODF currently does not have a feature that allows authors to mark objects as decorative. I have submitted a feature request for this to the OASIS ODF committee. *** This bug has been marked as a duplicate of bug 138504 ***