When editing pages in Visual Editor, the text appears from left to right in right-to-left wikis. It's supposed to appear from right to left, of course.
This happens in all RTL wikis: Hebrew, Yiddish, Persian, Arabic. I reproduced it on Windows, Firefox 61 and Chrome 68.
From Special:Version: This in MediaWiki 1.32.0-wmf.19 (rMW0b2f56ab74cb), VisualEditor 0.1.0 (bf9d3c1).
Marking as Unbreak Now, because it makes VE almost unusable in these wikis.