Test java/awt/Modal/ZOrderTest6271792/ZOrderTest.java fails

Testsuite name: jdk_awt
Test name(s): java/awt/Modal/ZOrderTest6271792/ZOrderTest.java
Product(s) tested: jdk 11.0.5b01
OS/architecture: Ubuntu19.04

Reproducible: Always
Reproducible on machine: llg00tuo.uk.oracle.com (Ubuntu 19.04)

Is it a Regression: No, Fails with JDK11.0.4 as well.
Test result on the last GAed release for this train:
1)On the same platform/option with JDK11.0.3(b11) : Failed as the same issue
2)On the same platform/option with 11 GA :Failed as the same issue

Does it affect JDK13 : Yes, fails with JDK13(b24)

Is it a platform-specific issue: Yes (Test fails on Ubuntu but passes on linux.)

Exception/Error from log:
 Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: Frame F1 is above its modal blocker dialog