iso-8601-style date with 12-hour time does not parse

$ date -d '2025-01-01 12:00am'
date: invalid date '2025-01-01 12:00am'

This works with GNU date (coreutils 9.8).
Interestingly, 01/01/2025 12:00am and 2025-01-01 00:00 both parse, suggesting it may be some kind of mixed-locale issue?

$ locale
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=
$ date --version
date (uutils coreutils) 0.4.0

Arch Linux

Start by reproducing the failing date -d '2025-01-01 12:00am' command and compare it with the working numeric-time and slash-date examples in the report. Trace the date command's input parsing entry point and verify the fix against the reported locale and GNU coreutils behavior; done means the ISO-8601-style date with 12-hour midnight parses correctly without regressing the existing examples.