I would have to agree with this, the behaviour of the new composer is strange and unintuitive when it comes to a simple thing like pressing return. Between this and a bunch of other immediate bugs that I’m trying to reproduce, I would have to say that this is a feature which doesn’t quite feel ready for prime-time yet. 
If the new composer were the default at the moment for example, posting on my site would be completely broken, as many times I’ll post images that I have hosted at Flickr.
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