Time manipulation inconsistency with ActiveSupport::TimeZone

[questquest]

Steps to reproduce

irb(main):001:0> zone = ActiveSupport::TimeZone['Moscow']
irb(main):002:0> zone
=> #<ActiveSupport::TimeZone:0x0000560d29ccf8d0 @name="Moscow", @utc_offset=nil, @tzinfo=#<TZInfo::DataTimezone: Europe/Moscow>>
irb(main):003:0> t1 = Time.new(2021, 5, 29, 0, 0, 0, '+03:00')
irb(main):004:0> t2 = Time.new(2021, 5, 29, 0, 0, 0, zone)
irb(main):005:0> t1
=> 2021-05-29 00:00:00 +0300
irb(main):006:0> t2
=> 2021-05-29 00:00:00 +0300
irb(main):007:0> t1 + 1.days
=> 2021-05-30 00:00:00 +0300
irb(main):008:0> t2 + 1.days
=> 2021-05-30 00:00:00 +0600

Expected behavior

Both times should save time zone

Actual behavior

Time object created with time zone of Active Support does not save time zone

System configuration

Rails version: 6.0.3.7

Ruby version: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]

[questquest]

Reopened here #42467