Our hue integration doesn't translate ct or color commands to xy color comands which is all these bulbs support.
So without diving into the specifics he to hue color commands to these bulbs aren't going to work, and likewise hue to he color responses for these bulbs aren't going to work either.
This is likely the reason the scene switches are messed up.
We already have library code to convert hue saturation and level to xy, however going the other way has not proven to be in any way accurate.
Converting xy to color temperature in Kelvin appears to be impossible, but I don't have a PHD in math...
I don't know how the hue bridge deals with xy to color temp conversion for these bulbs, one of these days I'll have to play around and see.
Unfortunatly due to the time involved in this, it has been a back burner project.
I have ranted about the Ikea low budget color cluster implementation before, there is no free lunch as they say...
If someone smarter than me can deliver a formula to convert xy to color temp, I'd be happy to revive this effort.