@WhiteNoise
Well that is some way of solving it, but I like to use Ctrl+D in INSERT mode to remove lines.
To me this is still a bug as it clearly does two things where it should do just one. This is also not indicated nowhere in the app so the behavior is unexpected. Sounds a lot like a bug to me 
Also with that solution you will be closing probably one such bug report for each vim user because the problem isn’t solved globally, but only locally for me (and in a very not satisfying way).