It's been a while since I tested the Nanoleaf matter over thread A19 bulbs. When I was testing them, they were completely ignoring the fade/transition times set.
Is this just a known issue that they do this? (or perhaps it affects all matter-over-thread devices controlled from HE?) I can't seem to find any discussion on this particular issue
Can you be more specific about where you were setting the time, i.e., as a preference or as part of a command parameter?
There was a bug in the Generic RGBW Matter Light driver where setting the preference (the default value if no parameter is provided to such commands) to 0/ASAP ignored the value entirely. I wasn't aware of a problem with any other values. There was also a problem with 0 as an explicit parameter to some commands that accepted this, also fixed (both in the driver and at the underlying Matter level in the platform that could have affected other drivers, too).
But the Nanoleaf A19 Matter bulbs I've tried still have their own bug where any non-zero transition time goes much more slowly than you'd expect, possibly using that as a transition time for each step (percent? 0-254 internal level?) along the way rather than for the entire transition. Many Matter over Wi-Fi bulbs I tested suffer from the same spec misinterpretation. There isn't anything the hub can do about that, but using a value of 0 is probably the best workaround since it's the only thing that guarantees a non-slow transition in these cases.
And that's why I noticed 0 wasn't working before. 
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I was talking about the Transition Time / Duration settings in the Commands Page, and the transition time in preferences.....However, I've done a Firmware update via the Nanoleaf app and not the transition times are working (but it does spam the logs as they transition)!! Are yours up to date?
I haven't updated since I installed them about a year ago, but I see there a couple of interesting things in the release notes since then, including:
- Reduced reporting interval when using longer color temperature transition times in Matter
- Fixed a number of other minor issues
Not sure what that last thing is, but I'll see if it happens to be this one. 