Hi there
I can see that the post you mentioned does have related posts indexed, but they are not displaying for some reason.
To check if Cloudflare is affecting this, can you please try pausing CloudFlare as described here?
https://support.cloudflare.com/hc/en-us/articles/203118044#h_8654c523-e31e-4f40-a3c7-0674336a2753
After you’ve paused it, check your post again to see if the issue persists.
If that doesn’t help, there may be something else installed on the site that’s causing problems. The quickest way to figure out if something is interfering is to test for a theme or plugin conflict.
I know it’s less than ideal, but could you please try the following:
– Temporarily deactivate all the site’s plugins except for Jetpack and clear your browser’s cache.
– Then check the post again. If related posts display, then we’ll know that another plugin is conflicting here. You can re-enable your plugins one by one, checking the post in between, until you find the one causing the conflict. You can leave it disabled or reach out to the plugin developer for a fix.
If disabling plugins doesn’t help, it may be the theme.
– Temporarily switch your theme to a WordPress default theme like Twenty Twenty. Then check the post again. If related posts display, then you know it’s a problem with the theme, and you can reach out to the theme developer for a fix.
Let us know how that goes.