[kde] [Bug 451919] New: Changing time format back to default behaves weirdly

[David]

https://bugs.kde.org/show_bug.cgi?id=451919

            Bug ID: 451919
           Summary: Changing time format back to default behaves weirdly
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: david.cortes.rivera at gmail.com
  Target Milestone: ---

Created attachment 147736
  --> https://bugs.kde.org/attachment.cgi?id=147736&action=edit
format_warning

SUMMARY
If I change the time format in the system settings to something other than the
default, and then change it back to the default, somehow it will not behave the
same as an unchanged system default anymore, and some applications give me
warnings about it (see screenshot).

STEPS TO REPRODUCE
1. Go to System Settings -> Regional Settings -> Formats -> Time, and select
something other than the default.
2. Reboot the computer.
3. Repeat step 1, but this time selecting the default.
4. Reboot the computer.
5. Use random non-KDE applications and see what they have to say, such as
sublime text.

OBSERVED RESULT
Some appications give warnings about the system formats being invalid.

EXPECTED RESULT
Everything should work the same as if the formats had never been changed.

SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux
KDE Plasma Version: 5.24.3
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
Kernel Version: 5.16.0-5-amd64 (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 2700 Eight-Core Processor
Memory: 15.6 GiB of RAM
Graphics Processor: AMD VEGA10

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