I was trying to use the new Teoz engine to produce parallel event in the sequence diagram. However, when I was trying to use parallel notes at the same time, I ran into a crash. It is difficult to know what goes wrong, but below is a minimum test case for the crash:
!pragma teoz true
rnote over P2 : note 1
/ note over P1 : note 2
Commenting any of the lines will avoid the crash.
Plantuml version: 8041, java version 1.8.0_91, graphviz version 2.38.0
Regards, Ville Eerola