Open attachment 98549 [details] from bug 78333, a DOCX, save it back to DOCX format, and try opening it in Word. => Word can't open the file cleanly. If one: - unzips the saved DOCX, - executes the following command (can be done in Linux/Cygwin, needs xmllint installed): find . \( -name "*.xml" -o -name "*.rels" \) -type f -exec xmllint --output '{}' --format '{}' \; - rezips the files with DOCX extension, Word points to line 552 in word/document.xml, which is this line: <w:date w:fullDate=" 2012./2013.T00:00:00Z"> The document has a date picker content control with the value: " 2012./2013." Based on section 17.5.2.7 date (Date Structured Document Tag) of the OOXML specification, fullDate should be written as ST_DateTime (xsd:dateTime) type. However, when looking at the original document, it simply has <w:date> without an attribute, which makes more sense when the value isn't a valid date. This is a regression/implementation error from the following commit in 7.4, and from its backport in 7.3: https://git.libreoffice.org/core/commit/a4432eb0946c0bc775b3d30b634bef5d66544f8d author Vasily Melenchuk <vasily.melenchuk@cib.de> Wed Nov 24 14:50:12 2021 +0300 committer Thorsten Behrens <thorsten.behrens@allotropia.de> Tue Dec 21 23:23:51 2021 +0100 tdf#104823: support for sdt plain text fields