the autonumber variable is displayed incorrectly if the note is assigned between two participants
@startuml
participant a
participant b
participant c
autonumber
a -> b :msg
note over a : %autonumber%
note over a,b : %autonumber%
b -> c :msg
note over b,c : %autonumber%
note over b : %autonumber%
return msg_ack
a <-- b :msg_ack
@enduml
