Tested out multiple versions of MidnightLib, blur effect is not being applied to any screen. Tested on multiple different containers, none works. Additionally, upon closing inventory a jarring blur effect fades out in pulse.

same issue. setting fade in/out to 0 helped me

I fixed this in the 1.21.4 version, but it seems like there's quite a lot of demand for a backport, so I'll start working on it.

@Motschen

As a temporary fix you can set the Fade in and the Fade out to 0 and the blur will start working again. The issue seems to be with how it fades in making it not appear if it is anything but 0.

Same issue