I tried using visual editor in Japanese and Korean Wikipedia and found no problems. I think it is safe to assume that this is another Chinese-exclusive problem.

As with previous experiences with Chinese language-exclusive problems, @Winston_Sung do you have any idea?

The problem may not appear when safe mode is activated. That means this is most likely a local gadget issue. Sorry for casting doubt on the translation team.

This is caused by an on-wiki gadget: https://zh.wikipedia.org/w/index.php?title=MediaWiki%3AGadget-VariantAlly.js&diff=79927662&oldid=79892477

@Jdlrobson's edit fixed it throwing exception but caused it to return undefined, causing more breakage.

As the maintainer of the gadget I suggest change line 140:

} catch (e) {
	return; // <-- here
}

into:

} catch (e) {
	return link;
}

and link 213:

var anchor_1 = target.closest('a');

into

var anchor_1 = target.closest('a[href]');

Appears to the VariantAlly script: https://github.com/wikimedia-gadgets/VariantAlly/issues/4

Caused by VariantAlly function rewriteAnchors .

在T352501#9375007中，@Diskdance写道：

This is caused by an on-wiki gadget: https://zh.wikipedia.org/w/index.php?title=MediaWiki%3AGadget-VariantAlly.js&diff=79927662&oldid=79892477

@Jdlrobson's edit fixed it throwing exception but caused it to return undefined, causing more breakage.

As the maintainer of the gadget I suggest change line 140:

} catch (e) {
	return; // <-- here
}

into:

} catch (e) {
	return link;
}

and link 213:

var anchor_1 = target.closest('a');

into

var anchor_1 = target.closest('a[href]');

fixed

This still sets an href, it just sets the href to the current page. Now click on OOUI tools reload the page. The fix to the library (https://github.com/wikimedia-gadgets/VariantAlly/pull/5) should cause it to skip over non-href <a> tags.

I've applied my own fix with @disksance 's blessing and things appear to be working now.

@Esanders Can this ticket be closed now?