Text and image follow the natural flow of HTML and CSS. Inner block use content width is ON .is-layout-constrained.
As of WP 6.1.1 the constrained layout type is the default for Group block.

Text and image follow the natural flow of HTML and CSS. Inner block use content width is OFF .is-layout-flow

Text and image are adjusted based on Flexbox CSS

Text and image are adjusted based on Flexbox CSS

One major difference between flex and constrained/flow layout types is how they handle block spacing. Instead of applying the blockGap value to a block’s margin-block-start property, the value is applied to the containing block’s gap property.
Since TT3 blockGap value is 1.5rem, you have to overrule it via the Editor by setting the blockGap for this specific Columns block to 0.
Block 1
The foundation on which aesthetics, user experience, and functionality is built.
Block 2
The foundation on which aesthetics, user experience, and functionality is built.
Block 3
The foundation on which aesthetics, user experience, and functionality is built.