Join does't work

[leolami]

Checklist

• I've searched through the existing issues and this bug has never been reported before

Subject of the issue

I have a project with a join 1:1
Layer Particelle (father)
Layer Sommarioni (child)

When I upload and save the project, the first time the join doesn't result after query the Particelle layer

If i resave the project the join appears

Steps to reproduce

Test the prohet/data zip sended by mail

Environment

3.8.1

Link to your project

No response

Additional info

No response