withFontSizes bug in WordPress 5.8 release

[AnthonyLedesma]

With the release of WordPress 5.8 the withFontSizes HOC within '@wordpress/block-editor' has bugged behavior. The CoBlocks implementation of withFontSizes has remained unchanged for over two years yet is non-functional in 5.8.

https://github.com/godaddy-wordpress/coblocks/blob/4b6a23ebbca9a9702acf88316cf35aeedad8a5da/src/blocks/highlight/edit.js#L136

https://github.com/godaddy-wordpress/coblocks/blob/4b6a23ebbca9a9702acf88316cf35aeedad8a5da/src/blocks/highlight/inspector.js#L36-L40

Description

It seems that while migrating to the new global settings schema that some items may have been left out.

Step-by-step reproduction instructions

1. Add Highlight block. (Happens on any blocks using withFontSizes HOC)
2. Modify block font size and save changes.
3. Reload the editor to see an invalid block state.

Expected behaviour

Expect API changes to withFontSizes to allow deprecation.

WordPress information

• WordPress version: 5.8
• Gutenberg version: 11.1.0
• Are all plugins except Gutenberg deactivated? (Except CoBlocks where we implement the HOC)
• Are you using a default theme (e.g. Twenty Twenty-One)? Yes

This does not occur using the same steps on 5.7.2

Device information

• Device: Desktop
• Operating system: IOS
• Browser: Chrome/Firefox

[AnthonyLedesma]

This might be related to the issue reported here as the problem is only visible after save and reload.
#33636