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In https://github.com/espressif/arduino-esp32/blob/master/libraries/ESP32/examples/RMT/RMTWriteNeoPixel/RMTWriteNeoPixel.ino lines 64 and 65 there is an off by one error.
The shift is too much. for the first iteration of the loop 1<<(8-0) is 100000000 which is not the desired bit mask. The desired bit mask is 1000000. It should be 1<<(7-0)
for (bit=0; bit<8; bit++){
if ( (color[col] & (1<<(8-bit))) && (led == led_index) ) {
There is a comment from @VerusLogic in the related commit about this problem.
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