When spreadsheet is saved hyperlinks are corrupted (adds %00%00%00%00%00%00 to url). When spreadsheet is reopened links no longer work.
Please what file format do you use to save the file?, what LibreOffice version?
Version: 6.2.2.2 (x64) - Excel 97-2003 (because of shared comparability) - links are such things as WIKI webpages.