You are right. It solves the problem.
But I am still puzzled why the section became 6 pixels too high. I would expect that the height of a section (just a div) is determined by the height of the highest component in the.
It looks like the 6 pixels extra are being set in a div with class "sppb-row-container"; that one has a height of 666px. See [https://prnt.sc/XSJHRnJSyyMa]). While the section div one lievel up has a height of 660px.
But where are the properties of this class set? In teh backend of the Pagebuilder I have settings for the section and settings for the columns and settings for the components. But I cannot find settings for the row.