[styled-engine-sc] Unknown prop "sx" warning when using styled with styled-components v6

Steps to reproduce

Link to live example: https://codesandbox.io/p/sandbox/mui-styled-components-prop-forwarding-knft9v

Steps:

1. Setup styles with styled-components (https://mui.com/material-ui/integrations/styled-components/)
2. Use styled('div') from @mui/material/styles
3. Add sx styles to the created component
4. Warning in dev tool console & sx in rendered div

Current behavior

The given sx property isn't removed in the rendered div:

<div sx="[object Object]" class="sc-guDLey idRkGC">Styled div</div>

Expected behavior

In the styled documentation is written:
It adds by default the shouldForwardProp option (that can be overridden), taking into account: ownerState, theme, sx, and as.
Therefore I would expect the sx property to be removed from the rendered div.

Context

No response

Your environment

package.json

• styled-components 6.1.8
• @mui/styled-engine-sc 5.14.12
• @mui/styles 5.15.14
• @mui/material 5.15.14

System

• Lates Chrome & MacOS version
• yarn 4.1.0

Search keywords: sx warning, styled, styled-components