Change city timezone

Greetings,

anybody knows how to correctly change the time zone of the city ?

I am using 8.1.3 (test environment) and 8.1.4 (production environment), common problem: Omsk have incorrect timezone.

Table DialogTimeZone. "Moscow+03, Omsk" refer to "(UTC+07:00) Novosibirsk" (UID_TimeZoneMS) not to "(UTC+06:00) Omsk"

meanwhile any changes in Designer is blocked: Base Data - Localization - Country - Россия - Time Zone (tab)

Thanks in advance