Steps to reproduce the issue

Add a field in the form xml file with published attribute set to value 1

<field
name="catid"
type="categoryedit"
label="JCATEGORY"
description="JFIELD_CATEGORY_DESC"
id="catid"
extension="com_content"
class="inputbox"
required="true"
published="1"
/>

Expected result

The form page should show the category form field with only published categories shown

Actual result

The field values include unpublished values shown in brackets, e.g. [category 1]

System information (as much as possible)

Joomla 3.8.6

Additional comments

Change the file components/com_content/models/forms/article.xml