Board Thread:Support Requests - Getting Technical/@comment-5117893-20190812131738/@comment-1038387-20190812143705

No. That's not how templates work; then you'd just have the template calling on itself and creating a template loop, which breaks things.

You need to copy (or preferably, import) Template:Citation/core from the original wiki. If the entire template was called Citation there, it's probably better to rename it Cite web/core once it's imported.