If a perfect language lacks proper diacritical marks then it is incompete thus not perfect. This actually caused the Quran verses to have multiple meanings due to the lack of proper marks, ie grammar errors. This is an error. An error corrected later. Ibn Taymiyyah, Jalal-al-Din-al-Suyuti, ibn ’Umar, al-Shafi’i, Jalalayn and Badawi all mention the issues caused by the perfect language being incomplete. This causes conflict over interpretation. Read the work of the scholars of your own religion... It is in fact an example of an error. Since these errors are found throughout the early Quran there are many errors.
Error - Definition and More from the Free Merriam-Webster Dictionary
Having multiple meanings in a single verse due to the incomplete language causes errors in accuracy which covers definition 1b, 1c, 2a, 3, 4b, and 5.