In the book of “LED Lighting: Technology and Perception”, the author talks about the thermal behavior of color semiconductor LEDs.

In a color tuning system like RGBO (red, green, blue and orange), it is completely flexible to design any color points in the CIE diagram and the precise control of the coordinate can be achieved. However, on account of the different thermal performance of each color semiconductor LED, the color stability in the system could be a mess if the temperature is not controlled.

Taking the orange LED as an example from 40°C to 80°C, the peak wavelength moves ~10nm toward longer, converting to the chromaticity coordinate that the shift is far more than 10-step SDCM. Just thinking how much of the deviation when mixing it with R/G/B LED, and each has different thermal behavior respectively, the final light would never be close to your original design if the thermal management is ignored.