Confirmed it is broken now after WordPress update 5.5.1, there’s no way for users to close the lightbox window, have to refresh the browser to close the lightbox. The following error is in the console:
Uncaught TypeError: d.get(…).style.removeAttribute is not a function
at HTMLDivElement.K (jquery.fancybox.min.js?ver=2.2.3:1)
at HTMLDivElement.r.complete (jquery-3.5.1.min.js?ver=3.5.1:2)
at c (jquery-3.5.1.min.js?ver=3.5.1:2)
at Object.fireWith [as resolveWith] (jquery-3.5.1.min.js?ver=3.5.1:2)
at u (jquery-3.5.1.min.js?ver=3.5.1:2)
at Function.S.fx.tick (jquery-3.5.1.min.js?ver=3.5.1:2)
at st (jquery-3.5.1.min.js?ver=3.5.1:2)