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The issue is not exclusive to the Classic Block. Here is a recording with the classic block converted to ordinary Gutenberg blocks:
If you inspect your front page code you will see that there are empty <p></p> that have zero height.
If you want empty paragraphs to have height i.e. bigger gaps, use styling (e.g. padding-bottom ) or if you really want empty paragraphs ( not really semantically correct) you can use styling to set a min height. on the existing paragraphs. e.g. .entry-content p { min-height: 1em; }
Unfortunately the block editor doesn’t have these as features so you will need to resort to customizer>additional css
@alanfuller Thanks for clarifying.