Mistake Delay isn't working

[Embyrwulf]

[Userscript] Wanikani Mistake Delay (new, version 2.x)

Obsolete tl;dr Use [Double-Check] instead. You can disable all of Double-Check’s features except Mistake Delay. This script is no longer supported, but it has been integrated into [Double-Check]. If you only want Mistake Delay, simply install Double-Check’s, then go into the script’s settings and disable all of the features except Mistake Delay. Your experience will be exactly the same as if you only had Mistake Delay installed. The reason for discontinuing Mistake Delay as a standalone s…

Does anyone know how to fix this script? I’ve had a go myself but still no luck.

or if there is a similar script?

[Kumirei]

Double-check 2 has this incorporated, get that instead