This line is a bit suspicious, and I doubt it will work as intended (from #3193)

https://github.com/Aircoookie/WLED/blob/999bec19f1bf37b344177a9aeffc752c5f4ae472/wled00/e131.cpp#L28

Compiler warning:

wled00/e131.cpp:29:57: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   uint8_t ddpChannelsPerLed = (p->dataType & 0b00111000 == 0b011) ? 4 : 3; // data type 0x1B (formerly 0x1A) is RGBW (type 3, 8 bit/channel)
                                              ~~~~~~~~~~~^~~~~~~~

If it is intended as ((p->dataType & 0b00111000) == 0b011), then the decision cannot become true. Any value & 0b00111000 will not have the lowest 3 bits sets, as they are masked out by "&".

Actually I'm not sure how it was indented to work, maybe the original author could take a look?