I am having Issue with wordpress visual and text editor. Visual editor doesn’t allow to write anything and when I switch back to text editor following code is inserted automatically.
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You will find many solutions from internet like clear cache, change the theme change the browser etc.
but my working solution is deactivate all the plugins and then check visual and text editor. It should work.
I found the issue is from most recognized plugin. but I will not tell the name. but I am giving the hint that it must be at the last or near by last position of your plugin list.
I have reported the issue from their website.