Trying to import modules into a local installation of MediaWiki 1.23.6, I had forgot to import Module:Message_box/configuration. As the title summarises, the big red "Script error" is not clickable when in preview mode. After the page is saved, it is clickable.
This bug can lead to confusion and frustration for editors who are trying to test and solve an error in preview mode. Confusion for the first-timers who hadn't experienced these errors before, and frustration because they would have to submit an edit which they can't check is correct.
<span class="scribunto-error" id="mw-scribunto-error-0">Script error<!--Lua error in package.lua at line 80: module `Module:Message box/configuration' not found.--></span>