Thank you for your continuous development.

I'm sorry if an issue has already been raised.
While testing version 5.6RC, I found something like a bug, so I'll report it.

When you click the replace button of the image that can be specified from the toolbar in "Image block" etc., the contents are shifted sideways.

The following image is an image of the bug reproduced on Twenty Twenty One.

My testing environment:

• OS: macOS Catalina 10.15.7
• Browser: Chrome
• WordPress: 5.6 RC1
• Language: Japanese
• Theme: Twenty Twenty One