[Paragraphs] PHP 8.1 TypeError: Drupal\webform\WebformRequest::getUrl()

I know this has been set as closed, but I am also getting this error by using the following steps:

1) I have a regular content type page that is already published
2) I set this page as draft and save it
3) I add a webform via a paragragraph, which has a webform reference field on it
4) I save the page
5) I view the page and get the same error as above

I know this is a very personalised set of steps, but I'm hoping this may shed a little more light on the issue.

Can confirm #2 works, but as you say in #3 we get the submission message.

Apologese if this has been sorted in a subsequent ticket.

I got this error when the Webform reference field is attached to a Paragraph - that is attached to a Node.
Patch works.

The patch is most likely suppressing a larger issue with how the last submission is being determined.

We need to come up with simpler steps to reproduce the issue.

I think #5 is catching that the issue has something to do with a webform embed via paragraph is not determining the correct source entity.

Paragraphs have become an ongoing challenge, and adjusting any of the existing logic without causing regressions is tough.

I have the same issue, manifesting when I load up the layout builder configuration for a view mode for the entity.

The proposed fix causes the switch/case to fall through to the next switch.

      case WebformMessageManagerInterface::PREVIOUS_SUBMISSION:
         $webform_submission = $this->getSubmissionStorage()->getLastSubmission($webform, $source_entity, $this->currentUser);
-        $args = [':href' => $this->requestHandler->getUrl($webform_submission, $source_entity, 'webform.user.submission')->toString()];
-        return $this->getCustomMessage('previous_submission_message', $args);
+        if ($webform_submission) {
+          $args = [':href' => $this->requestHandler->getUrl($webform_submission, $source_entity, 'webform.user.submission')->toString()];
+          return $this->getCustomMessage('previous_submission_message', $args);
+        }