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When using https://wordpress.org/plugins/classic-editor/ after WP 5.0 the check on https://plugins.trac.wordpress.org/browser/unique-title-checker/trunk/unique-title-checker.php#L160 fails to detect that we are not using the Gutenberg Block editor, but the Classic WYSIWYG via the plugin.
This results in being enqueued the unique-title-checker-block-editor.js file on the WP backend instead of unique-title-checker.js.
I’ve sent a PR on GH fixing this if you are interested: https://github.com/2ndkauboy/unique-title-checker/pull/6