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After last update (not 100% sure if it affects since last update 3.34.3 or the one before, because this last days there have been two updates AFAIK)
The thing is that after this, the WordPress default code/theme Editor breaks and can’t save the contents within (theme-editor.php)
Something went wrong. Your change may not have been saved. Please try again. There is also a chance that you may need to manually fix and upload the file over FTP.
I know that the faulty plugin is Mailpoet, because it just works fine when I disable it.