I think this is an intended feature, not a bug.

Though, I can't work out what's causing it.

There's nothing to help at https://www.mediawiki.org/w/index.php?title=Auto-redirect

It's not https://www.mediawiki.org/wiki/Extension:AutoRedirect

It's a JavaScript script in https://en.wiktionary.org/wiki/MediaWiki:Common.js

@Jidanni: Please follow https://www.mediawiki.org/wiki/Help:Locating_broken_scripts before reporting any further issues in Wikimedia Phabricator. Thanks.

I posted https://en.wiktionary.org/wiki/MediaWiki_talk:Common.js#My_fault? because I just checked and the problem even happens for non-logged in users.

@Jidanni -- if you don't like it try this:

1. Disable JavaScript in your browser; just for Wiktionary.com should be OK.
2. OR Add the following code to your custom.js:

if (window.disableAutoRedirect) return;

(I haven't tested it, but it should work)

And also...

3. If you are going to post to https://en.wiktionary.org/wiki/MediaWiki_talk:Common.js don't be vague in describing your complaint. What does https://en.wiktionary.org/wiki/MediaWiki_talk:Common.js#My_fault%3F even mean? What exactly is your problem? What exactly do you want?

All I am saying,
is that the innocent public, not logged in or anything,
using a standard browser, "Chrome",
will see weird behavior, that I reported.

And I am being blamed for filing a frivolous bug report.

It doesn't matter if I don't like it or not.
I am saying it looks unexpected to the general public.

Fine. I will fix my note on that talk page.

@Jidanni --

What you think of as "weird behavior" is a feature that a Wiktionary editor has deliberately implemented on Wiktionary. Presumably that editor thinks it's a benefit to the "general public." But, they must abide by consensus on Wiktionary, so the place to comment on that is Wiktionary, not here.

This is not a "frivolous bug report;" it's an invalid bug report because (1) it doesn't concern MediaWiki core or extensions, and (2) it's not a bug.

And you still haven't really specified enough detail in your complaint at https://en.wiktionary.org/wiki/MediaWiki_talk:Common.js#Some_problem_that_I_don't_understand

@Jidanni

My apologies. I now realise you were being vague because you didn't understand. The code that offends you is this:

// == "Did you mean" auto redirect ==
/**
 * This will redirect in 3 seconds if a link enclosed in id="did-you-mean"
 * is found, and add the text "Auto-redirected from X" under the top header
 * if a rdfrom is passed in the get parameters.
 * Pages with wynn ([[ƿ]]) will be redirected immediately.
 **/

$.when(mw.loader.using(["user", "mediawiki.util"]), $.ready).done(function () {
	if (window.disableAutoRedirect) return;

	var rdFromValue = mw.util.getParamValue("rdfrom");
	if (rdFromValue) {
		$("#siteSub").after(
			$("<div>")
				.attr("id", "contentSub")
				.append(document.createTextNode("(Auto-redirected from "))
				.append(
					$("<a>", {
						href: mw.util.getUrl(rdFromValue, { redirect: "no" }),
						addClass: "new",
					}).text(rdFromValue)
				)
				.append(document.createTextNode(")"))
		);
	} else {
		// Redirect as quickly as possible from [[ƿ]] title to [[w]] title.
		var pageTitle = mw.config.get("wgTitle");
		var isWynnTitle = /ƿ/i.test(pageTitle);
		var didYouMean = $("#did-you-mean a").html();
		var target = didYouMean
			? didYouMean
			: isWynnTitle
			? $("#go-to-search-page a").html()
			: null;
		var timeout = isWynnTitle ? 0 : 3000;
		window.setTimeout(function () {
			var canRedirect = mw.util.getParamValue("redirect") != "no";
			var action = mw.config.get("wgAction");

			if (
				target &&
				target !== pageTitle &&
				canRedirect &&
				!window.disableAutoRedirect &&
				(action == "view" || (isWynnTitle && action == "edit")) &&
				mw.config.get("wgArticleId") === 0 &&
				mw.config.get("wgNamespaceNumber") === 0 &&
				!/Redirected from/.test(jQuery("#contentSub").html())
			) {
				window.location = mw.util.getUrl(target, { rdfrom: pageTitle });
			}
		}, timeout);
	}
});

As you can see if you read it, it counts 1 Mississippi, 2 Mississippi, 3 Mississippi, then if Javascript hasn't fallen over yet, it grabs the user and "whisks them away" to the "actually, did you mean...?" page.