[WP6.1] Calender and Archive blocks are broken when fontFamily is changed

[t-hamano]

Description

Originally reported in trac: https://core.trac.wordpress.org/ticket/56678

The following two blocks, which support typography, cause errors when changing the font family.

• core/archives
• core/calendar

This does not occur when the gutenberg plugin is enabled, nor in other blocks that support font families. I expect this is a problem unique to dynamic blocks using ServerSideRender.

Step-by-step reproduction instructions

• Insert the calender block or the archives block.
• Change the font-family from Typograph panel.
• Confirm that the block is broken.

Screenshots, screen recording, code snippet

46abe27eba03ca749803b73c12d21d1e.mp4

The browser console records a 500 error in the API request and React errors:

Environment info

• WordPress version: 6.1-beta2-54344 (without Gutenberg plugin)

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

[t-hamano]

It is probably a REST API issue, as the endpoint displays the following error:

{
	"code": "rest_invalid_param",
	"message": "Invalid parameter(s): attributes",
	"data": {
		"status": 400,
		"params": {
			"attributes": "fontFamily is not a valid property of Object."
		},
		"details": {
			"attributes": {
				"code": "rest_additional_properties_forbidden",
				"message": "fontFamily is not a valid property of Object.",
				"data": null
			}
		}
	}
}

[t-hamano]

This issue has been resolved in #43937 and is closed.
I will also comment in #43937 whether this PR should be backported to WordPress 6.1.