Comment 2 for bug 1936254

This issue isn't happening on macOS (old Bash) or the LibreOffice build bots. They may not be using this file Module_helpcontent2.mk.

I do not know if this would be helpful, but do you know which shell the build system is using?

Either the find command is not finding the file or it is failing silently, or ln -sf is failing silently.

Could you try putting set -xv at the top of bin/unpack-sources and getting the output?