Hi Jaunjo, it's been a while since I've used the Split Focus Diopter feature on the universal thin lens camera. I noticed that rotations do not appear to have any effect on the image or the diopter guide. I remember it was working in much older builds. Here are my specs and an image to confirm what I am seeing.
A. Windows 10 Pro Version 20H2
B. NVidia Geforce RTX 3090 Founder's Edition
C. 32GB DDR4
D. Nvidia driver version 462.31
E. OctaneRender Standalone version 2020.2.3
F. OctaneRender plugin version 2020.2.3.1 (May 9 2021)
G. Host application: Houdini 18.0.597