After updating from 1.6 to 1.7 nomad variables not working anymore

After upgrade i receive this error :

Missing: nomad.var.block(nomad/

Has anything changed on the default ACL policy ?

This might be related to After upgrading from 1.6 to 1.7 receiving errors on nomad variable jobs · Issue #19555 · hashicorp/nomad · GitHub

Are clients and servers running the same major version of Nomad?