When a note is the first element in the "else" part of a group, the text of the group-header overlaps the note.

@startuml
!pragma teoz true
participant A
alt case 1
note over A: Foo
else case 2
note over A: Bar
end opt
@enduml
Tested with PlantUML 1.2019.7 and the newest beta.
This was still working back in 1.2019.3