Been stuck there for more than an hour now.
Did I break it?
That is unusual behavior.
I noticed that they have not yet fixed the max-rounds bug… so your game might run until there is some value overflow error… or the log file fills the available hard disk space… 
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Well, the other option is that my build artifact is to large.
I pulled in some ML libs , that basically produced a ±780Mb jar file. Gotta love those transitive dependencies…
I have now removed those (dropping my “real ML” aspirations for now), and portal seems to function correctly again.
So it seems, not only is there a 75Mb limit on your actual submission, somewhere there is also a limit on how big your produced executable can be. Well…that would be my guess given current information.