Olympus issued a new firmware update:
Corrected issue of C-AF not operating correctly when using the “LEICA DG ELMARIT 200mm F2.8 / POWER O.I.S. (H-ES200)” interchangeable lens produced by Panasonic.
via cs.olympus-imaging.jp/en/support/imsg/digicamera/download/software/firm/e1/