I received my first shipment of lights and am having issues with one of the strings. Hoping someone can sanity check to make sure I'm not doing anything obviously stupid. The string of lights is this one: (WS2811 icicles from ray wu) https://www.aliexpress.com/item/32310871722.html?spm=a2g0s.9042318.104.22.168b474c4dUY3cyQ The icicle string has an xconnect connector, and I've got an xconnect pigtail connected to my F4V3 board. I've verified the pigtail is correctly connected (it powers one of the non-icicle strings just fine, and it matches the wiring diagram ray sent me) When I plug in the string, some of the LEDs flash red briefly, so it seems to not be completed dead. But nothing lights up when I run any of the test sequences. Is there anything else I can test? or settings I can mess with? Thanks in advance!