Thanks for the report, and sorry about this regression.
We are currently doing a big change in how PlantUML renders diagrams and we are moving from skinparam to style.
Using the new style feature, you can write your diagram this way.
Now, even if we will encourage people to move from the old skinparam to the new style feature, we don't want to break existing diagrams and we are providing compatibility with the old skinparam syntax.
You just find an issue in that backward compatibility system and we are going to fix it to that your "old" diagrams will be still running.
We'll post a message here when this will be fixed.
There might be other regression so you are welcome to post other issues.
Thanks for your help (and sorry again about all that changes)