Multiple instances of HtmlWebpackPlugin breaks compilation

[SimenB]

I don't have a reproducible case yet, should have it soon (at work now, I'll get to it tonight).

The build crashes with no errors if I have multiple instances of HtmlWebpackPlugin in plugins. Exit code is zero, but there is no emit phase for webpack. No idea what crashes 😆

This is using a pretty advances setup, as noted I'll try to create a reproducible smaller case tonight