Ahaha yeah it bugged the hell out of me too. Near as I can tell, there's nothing wrong with the Open5GS S1AP message, so filing a GitHub issue isn't the way forward. I did speak with Baicells about it, but their response was sorta... Complex. tl;dr I'm somehow the first one to find it, and they probably won't be fixing it.
If you set the rate limits to ~200Mbps you should be able to achieve max throughput on your 227.
I've similarly run Open5GS on a few cursed systems - shame the OpenStick doesn't support band 48 (though, mine won't detect a SIM card anyway...) - I've snagged a few old Verizon MiFi models that happen to have B48 support in the interim, or my iPhone 11 which makes a good UE.
If you set the rate limits to ~200Mbps you should be able to achieve max throughput on your 227.
I've similarly run Open5GS on a few cursed systems - shame the OpenStick doesn't support band 48 (though, mine won't detect a SIM card anyway...) - I've snagged a few old Verizon MiFi models that happen to have B48 support in the interim, or my iPhone 11 which makes a good UE.