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It seems that with Blocksy 1.8.55 elements within a group are no longer delimited with max-width: var(--block-max-width); but with max-width: var(--wp--style--global--content-size);. This will cause the layout to be undesirably stretched.
These two sites show the different behavior: and . In both cases, a heading, a paragraph, and 2 columns are combined into a group that is full width.