@NiallG that’s weird. Maybe something in the difference between BRP072A42 and BRP072C42: we’ve just had a 4 head multi split installed (3xCTXM35RVMA, 1xCTXM25RVMA with a 5MXM100RVMA outdoor unit) and each head has a ‘C’ model wifi adapter.
When the IR remote controls the head I do see the status reflected in both their mobile app and HA albeit after about a minute. Of course as folks know the IR remote won’t know if the state is changed elsewhere, but at least in that direction it’s doing as we would want.
FWIW I’m using this custom component version of the plugin because the ‘C’ model needs HTTPS: Daikin BRP072C42 WIFI custom component