Since the last two cutting edge versions (I think) the behaviour of return key changed - now after pressing it in typing mode it starts a new line, but takes the last word with it too. Not sure if I enabled something, or there is some setting that got changed, but it makes it quite difficult to type in stuff in a clear manner.
Glyphs version: 3.2 (3182), Mac Mini m1 2020, Monterey 12.6