Not requiring image properly for custom post type

Plugin v1.2.2, WP v4.4.2. I just installed and activated the plugin on my local wordpress installation (no link unfortunately), and updated settings to only require a featured image for a custom post type (events). However, I’m still able to create a new event without a featured image and publish it. I never see an error message, and I’m never prompted to add a featured image or prevented from publishing or updating.

I tested this with the normal post type as well; same result. It looks like require-featured-image-on-edit.js isn’t even loaded on the admin pages when I edit or create a post. The plugin is installed and activated properly, because I can access the settings page for it and select content types and image dimensions. I’m also able to occasionally get this to work and force me to add a featured image, but I haven’t been able to reproduce this consistently.

I’m not sure the best way to troubleshoot this from here, but any hints in the right direction would be helpful. Thank you!

https://www.ads-software.com/plugins/require-featured-image/