Bug on version 12 ?

select To_Json(Current_Timestamp);
returns "2020-05-15T14:49:44.266342+00:00" on version 11.7 or 12.3

So I have lots of JSONS which have timestamp on them.

select
JS ->> 'mydate'::text,
to_timestamp((JS ->> 'mydate'), 'YYYY-MM-DD HH24:MI:SS')
from (select '{"somefield": true, "otherfield": true, "mydate":
"2020-04-02T18:26:50.941531-03:00"}'::jsonb) j(JS)

This SQL works fine on 11.7 but not on 12.3 version.

ERROR: invalid value "T1" for "HH24"
Detail: Value must be an integer.
Where: SQL function "castimmutabletimestamp" statement 1

Is that a version 12 bug or a server configuration ?

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