Ewa_curvature.slang, Zoom Factor, visual artifact

While playing Banjo-Kazooie, I noticed a visual artifact in the lower left corner. It’s only present after adjusting the Zoom Factor in the Shader Parameters. In my case I adjusted the Zoom Factor to 1.15, the minimum to fill the screen for this title. If I change the final Shader Pass from ewa_curvature.slang to crt-lottes.slang I don’t notice any issues, but I like to use ewa_curvature.slang because I don’t want to see moire. Is there any fix for this issue, or an alternative way to use crt-lottes.slang without the moire effect?