Hi,
Font modification leads to unexpected line brake inside a note - refer diagram below.
@startuml
skinparam wrapWidth 300
a -> b : init
note over a
long text long text long text long text long text long text <color #red>long</color> text long text long text long text long text long text <u>long</u> text long text long text long text long text long text long text long text long text long text long text
end note
a <- b : ack
@enduml