Tooltips don't show any speical characters

Tooltips don't show any special characters but their unicode codepoint if creating a tooltip out of formatted text data.

Code:

---

local sTooltipText = "This text is actually from the DB node, here is an Ä";
self.setTooltipText(sTooltipText);

---

The tooltip will show

Code:

---

This text is actually from the DB node, here is an "Ä"

---

without ""

I know how I can change it back, but can this be "fixed" to work as expected?