Minimum number of LEDs for a device?

[MetalOnes]

I encountered an issue with my setup.
I have 4 devices, all WLED with 2812 strips using e131.
Device 1: 30 LEDs
Device 2: 89 LEDs
Device 3: 59 LEDs
Device 4: 9 LEDs

Devices 1-3 work fine, but as soon as I try to apply an effect to Device 4, all of my strips freeze. I can clear the effects and apply them again, and the web interface still works fine, so it's not totally crashing.

I deleted and re-added Device 4, but this time told LEDfx there were 18 LEDs, and everything works fine again. Using the mirror option gives me the effect I'm looking for, so this workaround is fine.

I was curious though if this was a bug, or if there's a minimum as far as LED count.
Thanks!