The preview doesn't show any postmagic effects, but the screenshot you make should have them. How did you load in the plugin? On a character or did you load it in as a 'scene plugin'? (tab under the 3 horizontal bars icon).
Sometimes when I load in some plugins on a character, it bugs out. I do also have a super resolution plugin, which allows you to make screenshots up to 9k. If I load the plugin on a character, it bugs out many times and only get black screenshots. But works perfect under 'scene plugins' tab.
EDIT: I just tested the plugin, and it works perfect. So, the new update from yesterday didn't broke the plugin.