Hi Phil, just happened upon this thread, although i listed this recently int he bug forums
with exiftool 11.75, the "LUMIX G VARIO 35-100mm F2.8II" was listed in the composite lens id. with version 11.81+, this lens is showing as a lens id (and lens type) of "unknown (2 34 10)
note, in 11.75, there is no composite tag of "lens type"