[random test failure] CommentPreviewTest::testCommentPreview

Problem/Motivation

    Comment Preview (Drupal\Tests\comment\Functional\CommentPreview)
     ✘ Comment preview
       ┐
       ├ Failed asserting that a string is an instance of interface Drupal\Component\Render\MarkupInterface.
       │
       │ /builds/issue/drupal-3496259/core/modules/comment/tests/src/Functional/CommentPreviewTest.php:59
       ┴
     ✔ Comment preview duplicate submission
     ✔ Comment edit preview save

Steps to reproduce

Example: https://git.drupalcode.org/issue/drupal-3496259/-/jobs/3829641#L1340

Proposed resolution

Replace calls to State with KeyValue.

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet