No Margins with fresh WP 6.6.2

If WordPress is freshly installed in version 6.6.2, your plugin no longer works, the margins are not displayed and a warning message appears in the console (block-editor-outline-css was added to the iframe incorrectly)

For WordPress installations that are updated from previous WordPress versions to 6.6.2, everything still works perfectly (no warning messages)

The WordPress plug-in Bordered Blocks, which basically offers the same function, had the same problem. They have since fixed it, but unfortunately not completely.