ACP2E-3523: Issue with Default Attribute Option Value Behavior for Multiselect

Author: aplapana

app/code/Magento/ConfigurableProduct/Test/Mftf/Section/AdminNewAttributePanelSection.xml

@@ -25,7 +25,7 @@
         <element name="inputType" type="select" selector="select[name='frontend_input']" timeout="30"/>
         <element name="valuesRequired" type="select" selector="select#is_required"/>
         <element name="addOption" type="button" selector="#add_new_option_button"/>
-        <element name="isDefault" type="radio" selector="[data-role='options-container'] tr:nth-of-type({{row}}) input[name='default[]']" parameterized="true"/>
+        <element name="isDefault" type="radio" selector="[data-role='options-container'] tr:nth-of-type({{row}}) input[name^='default[']" parameterized="true"/>
         <element name="optionAdminValue" type="input" selector="[data-role='options-container'] input[name='option[value][option_{{row}}][0]']" parameterized="true"/>
         <element name="optionDefaultStoreValue" type="input" selector="[data-role='options-container'] input[name='option[value][option_{{row}}][1]']" parameterized="true"/>
         <element name="deleteOption" type="button" selector="#delete_button_option_{{row}}" parameterized="true"/>