imported/w3c/web-platform-tests/html/semantics/scripting-1/the-script-element/moving-between-documents/before-prepare-iframe-parse-error-external-module.html

This test is a flaky failure on iOS wk2 Debug according to history. First occurrence of failure at r264038. This is fairly soon after introduction

History:
https://bugs.webkit.org/enter_bug.cgi?product=WebKit

Diff:
--- /Volumes/Data/slave/ios-simulator-13-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/html/semantics/scripting-1/the-script-element/moving-between-documents/before-prepare-iframe-parse-error-external-module-expected.txt
+++ /Volumes/Data/slave/ios-simulator-13-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/html/semantics/scripting-1/the-script-element/moving-between-documents/before-prepare-iframe-parse-error-external-module-actual.txt
@@ -1,9 +1,10 @@
 CONSOLE MESSAGE: SyntaxError: Left side of assignment is not a reference.
+CONSOLE MESSAGE: ReferenceError: Can't find variable: scriptOnError
  
 
 PASS Sanity check around top-level Window 
 PASS Eval: Move parse-error external module script to iframe before-prepare 
 PASS <script> load: Move parse-error external module script to iframe before-prepare 
-FAIL <script> error: Move parse-error external module script to iframe before-prepare assert_unreached: Script error evennt fired unexpectedly Reached unreachable code
+PASS <script> error: Move parse-error external module script to iframe before-prepare 
 PASS window error: Move parse-error external module script to iframe before-prepare