Row element with stack orientation doesn't work

[matiasbenedetto]

Description

The row element with stack orientation doesn't work since #42452 was merged.

Step-by-step reproduction instructions

• Add a Row element
• Add two paragraphs inside the row element
• Select stack orientation in the row element
• Save the post and verify in the frontend that the elements are not vertically stacked.

Screenshots, screen recording, code snippet

The editor

Frontend:

Environment info

• WordPress 6.0.1
• Gutenberg trunk

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes