Enonic version: 7.6.1
OS: Enonic Cloud
I have a content-type where there is an option-set with a field-set inside it. When I save (or just preview) in content studio some of the fields inside that field-set is removed, and the content is marked as changed.
If I remove the field-set from the XML everything works as expected.
Here is the code for the content-type:
<?xml version="1.0" encoding="UTF-8"?>
<content-type>
<display-name>Article</display-name>
<super-type>base:structured</super-type>
<allow-child-content>true</allow-child-content>
<form>
<option-set name="contentType">
<label>Article or Event</label>
<occurrences minimum="1" maximum="1"/>
<options minimum="1" maximum="1">
<option name="article">
<label>Article</label>
<items>
<field-set name="articleDetails">
<label>Article Details</label>
<items>
<input name="thumbnailImage" type="ImageSelector">
<label>Thumbnail</label>
<occurrences maximum="1" minimum="0"/>
</input>
<input name="title" type="TextLine">
<label>Title</label>
<occurrences maximum="1" minimum="0"/>
</input>
<input name="preface" type="TextArea">
<label>Preface</label>
<occurrences maximum="1" minimum="0"/>
</input>
<input name="body" type="HtmlArea">
<label>Body</label>
<occurrences maximum="1" minimum="0"/>
<config>
<include>Strikethrough Subscript Superscript | Undo Redo</include>
</config>
</input>
<input name="reference" type="HtmlArea">
<label>Reference info</label>
<occurrences maximum="1" minimum="0"/>
<config>
<include>Strikethrough Subscript Superscript | Undo Redo</include>
</config>
</input>
<input name="articleDate" type="Date">
<label>Publish date</label>
<occurrences maximum="1" minimum="0"/>
</input>
<input name="articleTag" type="ComboBox">
<label>Select article's category</label>
<occurrences maximum="0" minimum="0"/>
<config>
<option value="projectweb">Projectweb</option>
<option value="report">Report</option>
<option value="publication">Publication</option>
<option value="job">Available positions</option>
<option value="news">News</option>
<option value="employee">Employee</option>
</config>
</input>
<input name="addedTag" type="TextLine">
<label>Add new categories</label>
<occurrences maximum="0" minimum="0"/>
</input>
</items>
</field-set>
<input name="showTags" type="ComboBox">
<label>Show article's tag</label>
<occurrences minimum="0" maximum="0"/>
<config>
<option value="report">Report</option>
<option value="publication">Publication</option>
<option value="job">Available positions</option>
<option value="news">News</option>
</config>
</input>
</items>
</option>
<option name="event">
<label>Event</label>
<items>
<field-set name="eventDetails">
<label>Event Details</label>
<items>
<input name="Location" type="TextLine">
<label>Location</label>
<occurrences maximum="1" minimum="0"/>
</input>
<input name="fromDate" type="Date">
<label>From Date</label>
<occurrences minimum="1" maximum="1"/>
</input>
<input name="toDate" type="Date">
<label>To Date</label>
<occurrences minimum="0" maximum="1"/>
</input>
<input name="time" type="TextLine">
<label>Time</label>
<help-text>Write the time of day for the event. For example: 09:00 - 16:00</help-text>
<occurrences maximum="1" minimum="0"/>
</input>
</items>
</field-set>
<field-set name="eventDescription">
<label>Event Description</label>
<items>
<input name="title" type="TextLine">
<label>Title</label>
<occurrences maximum="1" minimum="1"/>
</input>
<input name="preface" type="TextArea">
<label>Preface</label>
<occurrences maximum="1" minimum="0"/>
</input>
<input name="body" type="HtmlArea">
<label>Body</label>
<occurrences maximum="1" minimum="0"/>
<config>
<include>Strikethrough Subscript Superscript | Undo Redo</include>
</config>
</input>
<input name="articleDate" type="Date">
<label>Publish date</label>
<occurrences maximum="1" minimum="0"/>
</input>
<input name="articleTag" type="ComboBox">
<label>Select event's category</label>
<occurrences maximum="0" minimum="0"/>
<config>
<option value="report">Report</option>
<option value="publication">Publication</option>
<option value="event">Event</option>
<option value="job">Available positions</option>
<option value="news">News</option>
<option value="employee">Ansatte</option>
</config>
</input>
<input name="addedTag" type="TextLine">
<label>Add new categories</label>
<occurrences maximum="0" minimum="0"/>
</input>
<input name="showTags" type="ComboBox">
<label>Show article's tag</label>
<occurrences minimum="0" maximum="0"/>
<config>
<option value="report">Report</option>
<option value="publication">Publication</option>
<option value="event">Event</option>
<option value="job">Available positions</option>
<option value="news">News</option>
</config>
</input>
</items>
</field-set>
</items>
</option>
</options>
</option-set>
<item-set name="newsdesk">
<label>News info from Mynewsdesk</label>
<items>
<input name="mndId" type="TextLine">
<label>myNewsDesk ID</label>
<help-text>Do NOT edit this, we need it to sync correctly to My News Desk.</help-text>
<occurrences maximum="1" minimum="0"/>
</input>
<input name="repoId" type="TextLine">
<label>Repo ID</label>
<help-text>Do NOT edit this, we need it to sync correctly to My News Desk.</help-text>
<occurrences maximum="1" minimum="0"/>
</input>
<input name="thumbnailUrl" type="TextLine">
<label>Thumbnail URL</label>
<occurrences maximum="1" minimum="0"/>
</input>
<input name="lastUpdated" type="TextLine">
<label>lastUpdatedString</label>
<help-text>Do NOT edit this, we need it to sync correctly to My News Desk.</help-text>
<occurrences maximum="1" minimum="0"/>
</input>
<input name="mainImageUrl" type="TextLine">
<label>Main Image</label>
<occurrences maximum="1" minimum="0"/>
</input>
<input name="mainImageCaption" type="TextLine">
<label>imageText</label>
<occurrences maximum="1" minimum="0"/>
</input>
</items>
</item-set>
</form>
</content-type>