[9.0.6] Meeting is not sent to contacts

Hello,
I have an instance of Projeqtor configured as follows :
- Automatic mail is sent to "resources" for meetings of type A are reaching the state "MoM Sent"
- I have some users who are not resources, only contacts (some stakeholders of the project) and the checkbox "do not receive the mails from the team" is unchecked.

What happens :
1. I add such a "pure" contact to the project
2. I create a meeting, I can add the contact to the meeting and properly see it as a "resource" of the meeting
3. The meeting reaches the state "MoM Sent" and triggers the sending of the mail
4. The contact does not receive the mail and I can verify it through the sent mail list

I obviously would expect the contact to receive the MoM of the meeting

I didn't see anything about it in the 9.1.2 bugfix list.

Hope this helps,