• I have searched the issues of this repository and believe that this is not a duplicate.

Summary 💡

For component packages/material-ui/src/AccordionDetails/AccordionDetails.js. https://github.com/mui/material-ui/blob/next/packages/material-ui/src/AccordionDetails/AccordionDetails.js#L9

I don't see any reason of setting a display: flex onto the root div. The display: block style (on top of the fact that it does not require explicit setting) might even be preferred.

Unfortunately this is a breaking change :/.

Examples 🌈

Motivation 🔦