I run all jdk_svc group tests on Japanese Windows platform and found the failing tests:
sun/tools/jhsdb/JShellHeapDumpTest.java
sun/management/jmxremote/startstop/JMXStartStopTest.java

JShellHeapDumpTest

Starting Jshell
[JShell]:c:\work\jdk_latest\jdk\build\windows-x86_64-server-release\images\jdk\bin\jshell.exe
[JShell] | JShell??????? -- ?o?[?W????22-internal
[JShell] | ?T?v???????A?????????????????: /help intro

JShellHeapDumpTest expects "Welcome to JShell" as jshell command message,　but the message is printed in Japanese on Javanese environment.

JMXStartStopTest

Caused by: java.lang.Exception: Starting agent on poprt 61306 should report an invalid agent state
        at JMXStartStopTest.test_07(JMXStartStopTest.java:601)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        ... 6 more

JMXStartStopTest expects "java.lang.RuntimeException: Invalid agent state" as the exception message, but the message is printed in Japanese on Japanese environment.