If an empty path is set in LD_LIBRARY_PATH (e.g. /foo::/bar), we wind up passing --ro-bind-try --ro-bind-try to bwrap, where the second --ro-bind-try is treated as the source path to mount, and the next flag we pass gets treated as the destination path. The web process crashes with this confusing error: bwrap: Can't create file at /.flatpak-info: Read-only file system
Oops, already reported... *** This bug has been marked as a duplicate of bug 202880 ***