BUG #16571: "time with time zone" type can input '00:00:00+1559'::time with time zone

The following bug has been logged on the website:

Bug reference:      16571
Logged by:          osdba
Email address:      mailtch@163.com
PostgreSQL version: 13beta2
Operating system:   all
Description:

In Document(https://www.postgresql.org/docs/current/datatype-datetime.html),
"time with time zone" range is:  00:00:00+1459 to 24:00:00-1459

but you can input:

osdba=# select '00:00:00+1559'::time with time zone;
     timetz
----------------
 00:00:00+15:59
(1 row)

osdba=# select '24:00:00-1559'::time with time zone;
     timetz
----------------
 24:00:00-15:59
(1 row)

you can input range is :
00:00:00+1559 to 24:00:00-1559
not the "00:00:00+1459 to 24:00:00-1459"

Document error or this type bug?

all version postgresql have this strange phenomenon.