I found something weird with Jira linked issue preview card that I could not figure out and I hope someone can enlighten me.
So we have a few Jira Cloud sites.
So in one of our Jira sites, when I hover to a linked Jira issue, there is a open preview card so that I can view the linked issue in a dialog without losing the context.
The preview card is as shown below.

However in two other Jira Cloud sites, the preview card is just not available when hovering the linked issue. As you can see from the screenshot, I was actually hovering NPRA-130 but not preview card was shown.

Do you know if there's any setting to enable this preview card?