QtWebKit important rtl view bug

Hello. I see one rtl bug in last version of QtWebKit, which (I think) wasn't exists in 5.7 version.

<p dir="rtl"><span style="color:#FF0000">آزمایش</span>سلام عرض می‌کنم محضر کسی که می‌خواند.<br></p>

when I render this using QtWebKit, the output is unreadable, see attached picture.

But when I render using chromium, output is OK. see attached picture.

It's high important bug. With this bug, normal use of RTL texts will not possible