Created attachment 193800 [details] Sample XLSX with short-hand protectedRange protectedRange of XLSX is not supported in LO and that is bug 134920. XLSX files should be kept proper, though and they normally are. There is a possibility of short-hand version of range address in file (sqref="10:131" instead of sqref="A10:XFD131"), that is read by MSO. Sample is attached. LO opens it but saves wrongly. There is https://gerrit.libreoffice.org/c/core/+/166269 for that. This ticket is about applying the OOXML Standard that says that child attributes name and sqref of protectedRange are required. Without it, MSO says that XLSX is corrupted, and LO should also do it. That would safeguard XLSX in saving, so that potential wrong save is seen on next fileopen.