Hi, we have similar problem. Clearfy (clearly) conflicts with the backend editor screen, such as the WPBakery Frontend / Backend editor screen blue buttons are not displayed. Not the same for specific users/computers/environments tho. For me it works, without this issue, but it drops the following error to my client:
wp-auth-check.min.js?ver=5.4.2:2 Uncaught TypeError: Cannot read property ‘hasClass’ of undefined
at HTMLDocument.<anonymous> (wp-auth-check.min.js?ver=5.4.2:2)
at HTMLDocument.dispatch (jquery.js?ver=1.12.4-wp:3)
at HTMLDocument.r.handle (jquery.js?ver=1.12.4-wp:3)
at Object.trigger (jquery.js?ver=1.12.4-wp:3)
at Object.a.event.trigger (jquery-migrate.min.js?ver=1.4.1:2)
at HTMLDocument.<anonymous> (jquery.js?ver=1.12.4-wp:3)
at Function.each (jquery.js?ver=1.12.4-wp:2)
at a.fn.init.each (jquery.js?ver=1.12.4-wp:2)
at a.fn.init.trigger (jquery.js?ver=1.12.4-wp:3)
at Object.<anonymous> (heartbeat.min.js?ver=5.4.2:2)
(anonymous) @ wp-auth-check.min.js?ver=5.4.2:2
dispatch @ jquery.js?ver=1.12.4-wp:3
r.handle @ jquery.js?ver=1.12.4-wp:3
trigger @ jquery.js?ver=1.12.4-wp:3
a.event.trigger @ jquery-migrate.min.js?ver=1.4.1:2
(anonymous) @ jquery.js?ver=1.12.4-wp:3
each @ jquery.js?ver=1.12.4-wp:2
each @ jquery.js?ver=1.12.4-wp:2
trigger @ jquery.js?ver=1.12.4-wp:3
(anonymous) @ heartbeat.min.js?ver=5.4.2:2
i @ jquery.js?ver=1.12.4-wp:2
fireWith @ jquery.js?ver=1.12.4-wp:2
x @ jquery.js?ver=1.12.4-wp:4
c @ jquery.js?ver=1.12.4-wp:4
XMLHttpRequest.send (async)
send @ jquery.js?ver=1.12.4-wp:4
ajax @ jquery.js?ver=1.12.4-wp:4
l @ heartbeat.min.js?ver=5.4.2:2
(anonymous) @ heartbeat.min.js?ver=5.4.2:2
setTimeout (async)
d @ heartbeat.min.js?ver=5.4.2:2
v @ heartbeat.min.js?ver=5.4.2:2
h @ heartbeat.min.js?ver=5.4.2:2
(anonymous) @ heartbeat.min.js?ver=5.4.2:2
dispatch @ jquery.js?ver=1.12.4-wp:3
r.handle @ jquery.js?ver=1.12.4-wp:3
hope it helps somewhat. Any idea? Thanks!