Board Thread:Support Requests - Getting Technical/@comment-9605025-20190316015110/@comment-34804319-20190318175834

According to the talk page for the extension, it seems as though it's a known issue that the tag will not correctly display line numbers that contain 4 or more digits (and will also not work correctly if the language being highlighted is over 100 kB in size). Now, I haven't tried with 3-digit line numbers, but if even that is having issues, it might be worth a bug report.