Ah, that's strange – thanks for the report! Could you post some examples of the labels that produce the newline formatting as copy-pastable strings so I can try and reproduce this? It definitely seems like it's somehow related to the specific characters and how they're rendered inline Also, do any of your labels include spaces?
Edit: I think I found a problem where labels containing spaces would end up being wrapped and I fixed this for the upcoming patch release by ensuring the labels never wrap. This should also fix the problem you reported!
Edit 2: Just released v1.11.1, which should fix this and prevent labels from wrapping.