Fix hydration error suspense (#4640)

* Fix hydration of error boundaries

* add a regression test

* add more comments

* fix typos

* more typos

* fix clippy

Cargo.lock

@@ -5546,6 +5546,7 @@ dependencies = [
  "dioxus-hooks",
  "dioxus-signals",
  "futures-channel",
+ "futures-util",
  "serde",
 ]
 
@@ -5748,6 +5749,15 @@ dependencies = [
  "dioxus",
 ]
 
+[[package]]
+name = "dioxus-playwright-fullstack-errors-test"
+version = "0.1.0"
+dependencies = [
+ "dioxus",
+ "serde",
+ "tokio",
+]
+
 [[package]]
 name = "dioxus-playwright-fullstack-mounted-test"
 version = "0.1.0"