PD-10NXD-WH interaction on same circuit

I have two outdoor LED sconces on the same circuit, each connected to a single PD-10NXD-WH (with neutral wired in each case).

Each light works correctly independently, fully dimming. But when I turn both lights on at the same time, the first light dims. It appears to be similar to what is described as a "neutral interaction" problem in other posts, but it's on the same circuit.

Any ideas? I can rip out the Caseta Wireless dimmers and use normal on/off switches, but I was trying to add these outdoor lights to a home control that could manage outdoor lighting as well.

Thanks
ian

It turns out that the PD-10NXD-WH (with neutral wired) on the second LED outdoor sconce is enough to dim the first LED outdoor sconce, when the first LED outdoor sconce is simply wired with an off-the-shelf interruptor. When you turn on the second sconce, the first one dims. Seems like the PD-10NXD-WH is doing something (un)impressive to the neutral level of the circuit.

Interesting...You might try an ELV dimmer instead. Single LED lights are often trouble and the slightest voltage turns them on.