Commit eee799c9b97512f29eb5854ff965dbad79424242 ("Get rid of old SystemV timezones, as this has been fully removed upstream. Convert existing configuration to the "new" America/* names.") changed the mapping of EST from SystemV/EST5 to America/Indianapolis in 2020b-1. Therefore Ubuntu 20.04 "jammy" and newer are affected.
Vladimir, would updating EST to America/Indiana/Indianapolis be okay?
Commit eee799c9b97512f 29eb5854ff965db ad79424242 ("Get rid of old SystemV timezones, as this has been fully removed upstream. Convert existing configuration to the "new" America/* names.") changed the mapping of EST from SystemV/EST5 to America/ Indianapolis in 2020b-1. Therefore Ubuntu 20.04 "jammy" and newer are affected.
Vladimir, would updating EST to America/ Indiana/ Indianapolis be okay?