When you create a block for Gutenberg. The styling is correct on the front end but the back in in Gutenberg builder the styling is not showing properly.
The styles must also be defined for the admin interface. This is one of the less pleasant aspects of building blocks, knowing that the backend already has predefined styles etc… and that it is not recommended at all to load a full CSS framework (Bootstrap/Tailwind/Foundation) in the admin.
Note: I’m talking about the layout/grid mostly, as inline styles related to colors/bg color and so on can be visible on the backend and frontend.
Short: this is not a bug, but a feature 
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