Modbus TCP problems in SCADA-LTS

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I'm trying out SCAD-LTS with my trusty Modbus simulator ModRSim2.exe as a Docker image on a Windows 10 laptop. I'm having difficulty maintaining a stable connection to the Modbus TCP server. Update rate is at 1s. Data is beeing read, but alarms keep popping up (connection lost, checksum) and the connection keeps beeing reset.

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The checkbox is for encapsulating the Modbus RTU protocol in TCP data packets. Checking the checkbox was a bad idea (although it seemed to reduce the number of errors it actually made things a lot worse). I ended up increasing the cycle time from 1 to 2 seconds. That made the error messages go away. Weird, because I would not expect protocol errors to arise from short cycle times. I think it might be a bug(?)