After WordPress 5.4 Update Plugin doesn’t work

Yep agree. I have two websites with KC and both since the update are blocked with “please wait”

I have found a solution. Install classic editor plugin.

True, but I won’t have the functions from KC right?

What the @gayanakmeemana said is that if you install the classic editor the function from KC will work, because disable the Gutenberg Editor.

The problem is the new Gutenberg Editor features make the KC stop working.

Got it. thanks !