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(at)163(dot)com
PostgreSQL version: 13beta2
Operating system: all
Description:

In Document(/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.