TYPO3 Core

Steps to reproduce:

1. Add an inline element to your FlexForm configuration
2. Load the form and add a record.
3. Collapse the record
4. Save the form
5. Expand the record

The record will open correctly but the loading bar will never stop.

Example FlexForm field:

<settings.mysetting>
    <TCEforms>
        <label>Test</label>
        <config>
            <type>inline</type>
            <foreign_table>foreign_table</foreign_table>
            <foreign_field>parent_uid</foreign_field>
            <foreign_table_field>parent_table</foreign_table_field>
            <foreign_match_fields>
                <parent_field>parent_field</parent_field>
            </foreign_match_fields>
        </config>
    </TCEforms>
</settings.mysetting>