there is no menu item "More fields" in Insert > Field thus File > Properties > Custom Properties can not be inserted into document see Writer, where it works Version: 25.2.4.3 (X86_64) / LibreOffice Community Build ID: 33e196637044ead23f5c3226cde09b47731f7e27 CPU threads: 2; OS: Linux 6.8; UI render: default; VCL: gtk3 Locale: de-DE (de_DE.UTF-8); UI: en-US Calc: threaded
I can confirm that: Version: 25.2.4.3 (X86_64) / LibreOffice Community Build ID: 33e196637044ead23f5c3226cde09b47731f7e27 CPU threads: 8; OS: Windows 10 X86_64 (10.0 build 19045); UI render: Skia/Raster; VCL: win Locale: de-DE (de_DE); UI: de-DE Calc: CL threaded
But Calc is not Writer. *** This bug has been marked as a duplicate of bug 112573 ***