Issue on public schéma with Pg_restore

 Here is the context :

I have a db db1 with a schéma public on cluster C1.

This schéma doesn't have any privileges on public role. 

I have a dump of this db.

On an other cluster C2, the template1 doesn't contain schema public.

I have restored db1  on cluster C2 and i saw public role had the privilege create on the schéma public.

I cannot explain this

Thank you. 

Thomas?