FHIR Chat · error on update/create in R4 testserver · implementers

<?xml version="1.0" encoding="UTF-8"?>
<Organization xmlns="http://hl7.org/fhir">
    <id value="hl7"/>
    <extension xmlns="http://hl7.org/fhir" url="http://hl7.org/fhir/StructureDefinition/organization-period">
        <!-- from Element: extension -->
        <valuePeriod>
            <!-- from Element: extension -->
            <start value="2015-02-07"/>
            <!-- ?? 0..1 Starting time with inclusive boundary -->
        </valuePeriod>
    </extension>
    <!--    HL7 itself    -->
    <name value="Health Level Seven International"/>
    <alias value="HL7 International"/>
    <telecom>
        <system value="phone"/>
        <value value="(+1) 734-677-7777"/>
    </telecom>
    <telecom>
        <system value="fax"/>
        <value value="(+1) 734-677-6622"/>
    </telecom>
    <telecom>
        <system value="email"/>
        <value value="hq@HL7.org"/>
    </telecom>
    <address>
        <extension url="http://hl7.org/fhir/StructureDefinition/geolocation">
            <extension url="latitude">
                <valueDecimal value="34.199020000000004"/>
            </extension>
            <extension url="longitude">
                <valueDecimal value="-86.155151"/>
            </extension>
        </extension>
        <line value="3300 Washtenaw Avenue, Suite 227"/>
        <city value="Ann Arbor"/>
        <state value="MI"/>
        <postalCode value="48104"/>
        <country value="USA"/>
    </address>
    <endpoint>
        <!--   Endpoint that handles the v2 messaging for the external organization   -->
        <reference value="Endpoint/example"/>
    </endpoint>
</Organization>

error Organization.address.extensionElement is unknown or does not match
any slice (url="http://hl7.org/fhir/StructureDefinition/geolocation") for profile
http://hl7.org/fhir/StructureDefinition/Addressinvalid