Mail alert not working

So for completion sake I’ve installed LibreNMS on clean test server.
Everything done according to manual page. Apart from this.

Configured mail(smtp) in global settings.
Created default alert rules.
No custom transport created.

No notifications are coming through.
test-alert.php says “No configured transports”.
On my production server there is no indication here. It even adds record to event log “Issued…to transport ‘mail’…”

Adding transport with:
Contact Type: Role
Email:
Role: Admin
Default: Yes
Notifications start to work (on prod too).

Is this new default behavior? If so: should it be reflected in installation/configuration manual?
Previously you didn’t need to create default mail transport, it worked out of the box.