Since updating from 1.6.5 to 1.8.1, I've found that I'm frequently getting a bug where parts of my models are missing whole layers.
The models that I'm using are usually presupported, so they're not native Chitubox supports.
When I run the file through Photon Validator, I can have dozens of these missing layers, sometimes all on the same support, sometimes spread across different areas of the print. Slicing again does not fix the problem.
