Spotted in production. Two errors, but they come in pairs so they're clearly the same underlying bug:
Error reading SVG:Error domain 1 code 4 on line 1 column 1 of data: Start tag expected, '<' not found Warning: parsing XML declaration: '?>' expected in Entity, line: 1 in /srv/mediawiki/php-1.30.0-wmf.16/includes/resourceloader/ResourceLoaderImage.php on line 302
ResourceLoader is making me think we've got a bad SVG that someone checked in somewhere? No stacktraces obvs cuz that would make life easy and shit.
If the watch star is green click it, if you can't see the watchstar at all that's the problem.
After clicking it, notice it's absence.