Preload Cache is not working

https://ibb.co/8DNN0Nhf https://ibb.co/jP8dz53Q I enabled Cache Preload, setting it to trigger page caching every 60 seconds, caching 8 pages each time, and also enabled the Yoast extension.

After enabling this feature, I can see that W3 Total Cache starts a Cron task every 60 seconds. However, strangely, when I checked the Nginx logs, no pages were cached, and I also checked the website’s cache directory, but I didn’t see any file additions. https://ibb.co/spPzMHMz