Hi Frank,
Thank you for testing and confirming that the event ordering works correctly again.
We plan to release JEM 5.0.2 stable at the end of October. In the meantime, you can apply this fix to your production installation without installing the full beta package. Please back up your site and test the changes on a copy first.
github.com/jemproject/JEM-Project/commit/c7e7dcfe5c1bbeef9c1930607ec9ff5033de2774
Don't copy the test/... files are for testing (unit test).
Thanks again for your feedback!