Homekit - Issues when controlling multiple accessories

Hey guys - When using a scene or automation in Homekit that has multiple accessories, often (but not always) only one of the accessories will be set correctly - with the others not being set at all. I’ve only tested this with lights and switches - all controlled through an ISY. Has anyone else seen anything similar?

i’ve had this issue w/ both the new Homekit integration and with the Homebridge addon.