Dart-Code: Missed breakpoints when using part/part-of

I set a breakpoint on a print function, the print is shown in the debugger output various times but the debugger never pauses. Logs: https://pastebin.com/3rQDJsqu When I put a breakpoint on a much earlier point in my code it does pause so perhaps there is some change in the Dart VM related to JIT optimization, but thats just wild speculation. I can remember it working fine so far, my current dart version is 2.2.0-dev.1.1 which is already more than a month old.