We also saw this after a round of package upgrades on a cloud. python3-neutron went from 2:16.2.0-0ubuntu2~cloud0 to 2:16.2.0-0ubuntu3~cloud0 and ovn packages went from 20.03.1-0ubuntu1.1~cloud0 to 20.03.1-0ubuntu1.2~cloud0 (i.e. not an upstream version change).
We also saw this after a round of package upgrades on a cloud. python3-neutron went from 2:16.2. 0-0ubuntu2~ cloud0 to 2:16.2. 0-0ubuntu3~ cloud0 and ovn packages went from 20.03.1- 0ubuntu1. 1~cloud0 to 20.03.1- 0ubuntu1. 2~cloud0 (i.e. not an upstream version change).