Fixing LibreOffice Flatpak Opening Files from GNOME Dash

I use Fedora Silverblue with GNOME, and I have LibreOffice installed as a Flatpak. Recently, I hit a strange problem: when searching for an office document from the GNOME Dash — for example, an .odt or .ods file in my Dropbox folder — and selecting it, LibreOffice appeared to start, but then failed with an [ ]