I’ve added a setting to disable the pattern completely.
The dark-mode issues on Iphone are due to a bug in safari, which prevents the background-mode-blend property from working when the background-repeat is used… Quite annoying and I don’t have a workaround yet.
It might come down to two separate uploads for dark/light mode, which isn’t elegant at all.
Either way, I’d recommend for now to use it without the pattern, if you’re on Iphone and use your device in dark mode.