I'm guessing the LED is built in, and not all LED are fully compatible with Inovelli dimming. There are options for leading edge vs trailing edge dimming in the switch config. have no idea what that means or does but changing it might help. Try the Inovelli forum, they have tons of info on dimming
What firmware version do you have for the Inovelli switch? I have about 50 of the Inovelli blue switch/dimmer units that caused flicker with a variety of LED bulb brands until the latest firmware was installed.
LED dimming is a strange thing. I think it has to do with how the power is limited. I think in Zooz switches it is the difference between between Triac vs Mosfet dimming switches. of course that doesn't apply here though.
I'm emerging from the rabbit hole that is "unable to update firmware bug". Waiting on Inovelli to send me the special programmer needed to update the 1st batch of blue switches to V3 firmware