TYPO3 Core

Using FlexForm inline relations causes only the first relation getting tied to the parent, although all relations get stored.

How to reproduce:

Use the Styleguide Extension and create a new record of type "Form engine - flex". Switch to tab "inline" and create multiple inline records.
After saving, only the first inline record is visible (and related to the parent record), but all inline records are stored in the DB.

It looks like sInline of the parent record only takes the first child:

<T3FlexForms>
    <data>
        <sheet index="sInline">
            <language index="lDEF">
                <field index="inline_1">
                    <value index="vDEF">10</value>
                </field>
            </language>
        </sheet>
    </data>
</T3FlexForms>