Currently the app doesn't notify the user when he/she adds a non-latin script language description in latin script. Although in WD the the edits are triggered by the filters but the user is not notified at the time of adding the description.
Here a new user (Aditya Mishr) have started adding description at the the place where Hindi language description is supposed to be added. The edits has been reverted and notified on his talk page. But he may not have noticed it. In this page it has been mentioned '
If edits made through the Suggested Edits feature subsequently get reverted (but not if the edits are merely fixed or amended by other community members), users will lose access to Suggested Edits.
But the next day the user was able to add the English label to the Hindi description field after the all previous reverts. If a new user starts contributing towards Wikimedia projects they may not be fully aware of the policy regarding descriptions. So a short note (push / pop up) notification in a single page about the description policy for the first 3+ edits will be helpful for them to contribute.
In this image i have opened the page to add Malayalam language description. Here the heading is showing in English (may be Malayalam translation is not added) to add article description. I think if which language the description is going to be added is shown before the input field it be more helpful for newbie users. Like 'Article description in Malayalam' or the language it is been added to.
So a pop up notification before publishing the edits saying the entered description is not a latin script and displaying the language the description is going to be published can reduce the errors in the Suggestededit feature in the app.