Try this...
@startuml
hide footbox
!include ./Participants.pui
a->f:hello
create b
e->b:ola
create d
c->d:guten tag
d->c: auf wiedersehen
destroy d
b->e:adios
destroy b
f->a:goodbye
a->f:hello
create b
e->b:ola
create d
c->d:guten tag
d->c: auf wiedersehen
destroy d
b->e:adios
destroy b
f->a:goodbye
@enduml
I would expect the object line to begin at create (with the object tag) and end at destroy (at the X).