WebUI.setText on textarea gets added divs with katalon ids

When using WebUI._setText on a <_textarea> element, additional katalon divs get added to the text so the text value comes out as eg:

Test description
<div id="katalon">
<div id="katalon-elementInfoDiv"></div>

**OS **(OSX High Sierra 10.13.2):

Katalon Studio Version (5.3.0)

## Environment (for Web testing)

Chrome Version 63.0.3239.132 (Official Build) (64-bit)

## Steps to reproduce -

dynamicObject = new TestObject('dynamicObject').addProperty('id', com.kms.katalon.core.testobject.ConditionType.EQUALS,  'content', true)
WebUI.waitForElementVisible(dynamicObject, 3)
WebUI.setText(dynamicObject, 'Test description')


<textarea class="wp-editor-area" style="height: 322px; margin-top: 67px;" autocomplete="off" cols="40" name="content" id="content" aria-hidden="false">Simple product long description
&lt;div id="katalon"&gt;
&lt;div id="katalon-elementInfoDiv"&gt;&lt;/div&gt;
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