Cannot reproduce here with xfce and LibreOffice 7.02 Fresh. It must be something unique to your system. Maybe backup your LO configuration and try with a new LO config.
I can avoid the crash by changing libreoffice backend to GTK3 SAL_USE_VCLPLUGIN=gtk3 libreoffice but this is not ideal because the filepicker will be the gtk one.
Hello everyone watching this thread , it seems that this issue was resolved somewhere between ArchChem’s comment and the latest stable release (7.2.0.4 Community). I could not reproduce this issue anymore. If you have your own issues, i believe the forum guidelines ask that you make your own thread about your specific issue.