Broken Redactor field in Matrix + Unable to add matrix block to section

[threes-was-taken]

Description

Redactor issue: Redactor fields are not visible inside a matrix block when navigating to a section where a matrix is present. Other fields (plain text, image) are visible.

Matrix issue: We're not able to add new matrix blocks to a section since the upgrade to v4.

The following error is thrown inside the console when opening a section that contains matrices with redactor fields Failed to execute 'observe' on 'MutationObserver': parameter 1 is not of type 'Node'.

Steps to reproduce

Since it's not clear to us how/when this happened, we're not able to give reproduction steps.

Additional info

• Craft version: Pro v4.0.2
• PHP version: 8.0.17
• Database driver & version: MySQL 8.0.25
• Plugins & versions: Amazon S3 2.0.0 & Redactor 3.0.0

[threes-was-taken]

Fixed with latest 4.0.4 update