On my Vision G, if I set configuration of LEDs, for example, by RGB Fusion 2.0 under Windows and set "LEDs turned ON when sleep and soft off", then turned off PC - LEDs is On and configured as I want (only DIMM modules LEDs turned off).
But, when I press power button LEDs resets to default configuration (I think, when BIOS initialize USB devices), and only when system starts (Windows autostarts RGB Fusion, or macOS starts liquidctl script) it activates my LEDs configuration.
Can you test behaviour of Vision D LED controller?