Okay I kind of fixed it.
For this particular case, instead of
render_block($block)
I could use:
echo apply_filters( 'the_content', render_block( $block ) );
This works as long as the contact form is not in a block-column. That was my initial plan but I’ll fix that in CSS.
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This reply was modified 2 years, 11 months ago by silverfactory. Reason: typo