[exim] DSN in 4.86

We seem to have issue receiving delivery receipts. In the config we set
dsn_advertise_hosts = * and this used to work on a custom complied version
with the experimental feature on.
Now with 4.86 where the feature is no more experimental (to my
understanding) but should be active by default, the successful delivery
notification don't come back.
Any hint? Thanks

Max