Attributes are lost when changing the provider of an embed block

[fluiddot]

Description

The following attributes of the embed block are lost when the provider is changed:

• align
• caption
• allowResponsive

Step-by-step reproduction instructions

1. Add an embed block.
2. Set an URL (YouTube video example: https://youtu.be/UOcroR50808).
3. Click on Embed button.
4. Change alignment to Align left.
5. Add text to the caption field.
6. Click on Show more settings (if they're not already displayed).
7. Uncheck Resize for smaller devices option.
8. Edit the URL by clicking on the ✏️ button located in the block's toolbar.
9. Set a URL from a different provider (Spotify song example: https://open.spotify.com/track/6UB9mShVLbMm0W4e6vud4C?si=3b03fa64857f4919).
10. Click on Embed button.
11. Observe that alignment changed to the default value (Align center).
12. Observe that the caption text is empty.
13. Observe that Resize for smaller devices option is now checked (the default value).

Expected behaviour

Attributes should be preserved when the URL and provider change.

Actual behaviour

Attributes are not preserved when the URL and provider change.

Screenshots or screen recording (optional)

embed-block-attributes-lost.mp4

WordPress information

• WordPress version: 5.8-alpha-50771
• Gutenberg version: 11.0.0-rc.1
• Are all plugins except Gutenberg deactivated? Yes
• Are you using a default theme (e.g. Twenty Twenty-One)? Yes

Device information

• Device: Desktop
• Operating system: MacOS 10.15.7
• Browser: Chrome 91.0.4472.114