When saving some page using VisualEditor, "characters left" (e.g. 255) is under the text which comes from the Pending changes extension.
I have a picture to explain more. It's taken from the Finnish Wikipedia where is the Pending changes extension.
https://commons.wikimedia.org/wiki/File:To_explain_a_bug_with_VisualEditor_and_Pending_changes.png
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Severity: normal