TYPO3 Core

If one adds a group field to flexform like this:

<settings.test>
                        <TCEforms>
                            <label>Test</label>
                            <config>
                                <type>group</type>
                                <internal_type>db</internal_type>
                                <allowed>tx_test_domain_model_test</allowed>
                                <size>1</size>
                                <maxitems>9999</maxitems>
                                <minitems>1</minitems>
                                <multiple>1</multiple>
                                <autoSizeMax>30</autoSizeMax>
                                <size>10</size>
                                <show_thumbs>1</show_thumbs>
                                <wizards>
                                    <suggest>
                                        <type>suggest</type>
                                    </suggest>
                                </wizards>
                            </config>
                        </TCEforms>
                    </settings.test>

Results in element being added twice when using mouse click to select.
The issue does not exist when using keyboard Enter key.

The reason seems to be that it is added once via onSelect handler of autocomplete and once via the manual click handler.
Not sure if the manual click handler is actually necessary or if removing it would be a regression elsewhere.