How to fix difference of hours in timezone settings [ gnome timer ]

Question

It is generally known that Bangkok have UTC+7.

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But unfortunately my gnome timer shows UTC+4 for Bangkok

When I checking it by console I see

timedatectl status
               Local time: śro 2023-02-08 10:59:07 +07
           Universal time: śro 2023-02-08 03:59:07 UTC
                 RTC time: śro 2023-02-08 03:59:07
                Time zone: Asia/Bangkok (+07, +0700)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

So problem is probably with gnome timer.

I found issue describing this problem but it is closed. And 7 open issues connected with time zone for gnome clock.