Attached is an example which demonstrates that hyphenation is not done correctly with vertical text. Looks like the soft hyphenation character is displayed instead of being ignored (since there is enough space).
Please have a look at the attached print screen which shows the problem.
Using Java 1.8.0_45, Aspose Words 15.5.0
Thanks for your inquiry. We tested the scenario and have managed to reproduce the same problem on our end. For the sake of correction, we have logged this problem in our issue tracking system as WORDSNET-12072. Our product team will further look into the details of this problem and we will keep you updated on the status of correction. We apologize for your inconvenience.