Preload not working

Hi! First of all, thanks for the amazing plugin.

Preloading isn’t working, event though there are no errors on the plugin and PHP logs nor the browser console. Purging working as expected.

Here is the plugin log:
https://share.cleanshot.com/xwlnhsNQ

And here is the plugin status tab:
https://share.cleanshot.com/xwlnhsNQ

What could I have missed?

One more question: does the plugin support custom post types?

Thank you again!