double slash in link

Same here.
Links in "new comments posted" are correct.
Links in "Recent new or updated pages" contain an erroneous extra slash.

We are seeing this also.

This edit to line 670 of .../modules/contrib/notify/src/notify.php fixed it for me.

-  $link = $host . '/' . Url::fromUri('internal:/node/' . $node->id())->toString();
+  $link = $host . Url::fromUri('internal:/node/' . $node->id())->toString();