This is caused by the wrong event being used.

`keypress` is a Javascript event.

`keyup` is its JQuery equivalent.

We used JQuery in the fix for XWIKI-19965.

When testing with Firefox, I guess the browser fixes things and the event handler is properly run. However it's not the case with Chromium and the feature is broken on these browsers.

An easy fix is to replace the Javascript event name with the proper JQuery one