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This seems to be intentional. https://github.com/joomla/joomla-cms/blob/4.0-dev/templates/cassiopeia/scss/blocks/_layout.scss#L33 there's a 4rem top and bottom padding which means top-a and top-b there's 8rem padding.
We had a big discussion about white space between modules... we can replace padding with margin, then it will not sum up between containers
There shouldn't be any padding or margins. It's using css-grid, so it should be dealt with by
J4 Frontend Template
|Closed_Date||0000-00-00 00:00:00||⇒||2021-04-25 16:23:37|