Questions of Backward_Procedure

[MorningSTA1Rrrrrr]

Wonderful Implement of Taichi-3DGS! A question here.

In the bakcward procedure, I found that the gradient of translation did not be considered in the Sphercial Harmonics part. Actually in
the official code, the gradient dRGB/dx,y,z , is also considered. The following is the official cuda part's code.

Am I miss something?