The TypoScript settings from settings.list. * have been removed because they were outdated. Changes must be transferred over into settings.search. *.

In addition, the for-each loop in the Property / Search / Item.html Partial must be changed.

From:

<f:for each="{settings.list.fieldsets}" as="fieldset" key="fieldsetKey">

To:

<f:for each="{settings.search.fieldsets}" as="fieldset" key="fieldsetKey">