Commandline map loading broken?

Hello,

I just finished packaging a ship build of our project and cannot get the commandline arguments to work for loading a specific map or even logging.

I have a build from the 3rd of March that works fine when passing in smthn like
D:\PackagedBuilds\Project\Project.exe /Game/Maps/MyMap?listen -game -windowed -ResX=1280 -ResY=720 -log=SRVlog.log

And then other clients are able to connect via my IP.
For my build today, absolutely nothing I’ve tried with regards to syntax will load anything other than the default game map. Even the log isn’t being created. No difference in my package settings or DefaultGame.ini. The only difference that I can think of is that back in March we were on 5.7.3 and now we’re on 5.7.4

Anybody encountered smthn similar?

Thanks,
Shadi