Created attachment 167808 [details]
the system settings window

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SUMMARY


STEPS TO REPRODUCE
1. Go to: System Settings>Region & Language>Time>Modify, and Check for the zh_* paragraph
2. The time format of zh_TW.UTF-8 should either be 12-hour (with localized am/pm) or 24-hour
3. It is indeed prefixed with an unknown letter "B"

1. Set the system locale to Chinese(Taiwan) and re-login
2. Lock the screen
3. Check that the Clock widget is showning a "B" in front of the hour

1. hover over the default digital clock widget
2. the pop-up has a strange format of display of current time, different from shown as widget

1. have a file alternation from dolphin (copy, cut, download, etc.)
2. check that the notification have it done
3. after a while, check the notification history, the time of finish is displayed with a prefix of "B" instead of a normal time format.

OBSERVED RESULT

as explained above, a prefixed "B"

EXPECTED RESULT

a normal, localized 12-hour format, or a universal 24-hour format

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: ArchLinux
(available in About System)
KDE Plasma Version: 6.0.2
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION

Also confirmed on fresh installed OpenSuse Tumbleweed with Taiwan locale which utilize plasma 6 under VM.

a small qt c++ console application shows that it seems not related to C++/ICU/Glibc, but a fail in render in QML?