I tried the solution adding this JSP to my head libs. But my problem is still not fixed.
Initially the parsys has no height
I have a sly tag like this
<div data-sly-resource="${tabParsysName @ resourceType='wcm/foundation/components/responsivegrid'}"
data-sly-set.tabParsysName="tab-par-${tabList.count}"></div>
When I add a component the subsequent empty parsys has height
<sly data-sly-include="/libs/wcm/core/components/init/init.jsp" data-sly-unwrap/>