PostgreSQL AT Time Zone转换异常？实为DBeaver问题

我正在将UTC时间转换为美国东部标准时间（EST），但在2023年3月12日的“夏令时提前”时段发现异常：使用US/Eastern转换为东部现行时间正常，但用EST、Etc/GMT+5、America/Cancun三种方式转换第8行数据时，本该得到东部标准时间（UTC-5）的2023-03-12 02:00:00.000，却显示为2023-03-12 03:00:00.000，该行前后时段转换均正常。我不确定是操作有误、理解偏差还是存在bug，恳请协助排查。

查询SQL如下：

select start_time_utc as utc 
    , CAST(start_time_utc AT TIME ZONE 'UTC' AT TIME ZONE 'US/Eastern' AS timestamp) AS east_prevailing
    , CAST(start_time_utc AT TIME ZONE 'UTC' AT TIME ZONE 'EST' AS timestamp) AS eastern_stabdard_v1
    , CAST(start_time_utc AT TIME ZONE 'UTC' AT TIME ZONE 'Etc/GMT+5' AS timestamp) AS eastern_stabdard_v2  
    , CAST(start_time_utc AT TIME ZONE 'UTC' AT TIME ZONE 'America/Cancun' AS timestamp) AS eastern_stabdard_v3 
from public.crr_obligation_hourly
where unit_id =1 and extract(month from start_time_utc)=3 and extract(day from start_time_utc)=12
order by 1

查询结果截图：

更新：经排查，该问题实际由DBeaver导致，我将在下方发布解答。

内容的提问来源于stack exchange，提问作者sguo