Behavior Change Between slangtorch Versions

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The quality of my method, EVER, changes between slangtorch versions. On the latest update, 1.3.8, I get 22.79 PSNR at 7k iterations. On 1.2.8, I get 24.17 PSNR at 7k iterations. The only thing changing between these is the behavior of the following files, which use slangtorch:

https://github.com/google/ever/blob/fe6811328991ab03edcff4ef0462292e81be5c3f/splinetracers/fast_ellipsoid_splinetracer/slang/backwards_kernel.slang

Which is called from:
https://github.com/google/ever/blob/fe6811328991ab03edcff4ef0462292e81be5c3f/splinetracers/fast_ellipsoid_splinetracer.py

Another potential problem file is:
https://github.com/google/ever/blob/fe6811328991ab03edcff4ef0462292e81be5c3f/splinetracers/slang/sh_kernel.slang

Called from:
https://github.com/google/ever/blob/fe6811328991ab03edcff4ef0462292e81be5c3f/eval_sh.py

[half-potato]

Update: It's not likely to be the spherical harmonics.