New Timestamp format is not used in document

[chamomile93]

Version, Operating system
Ubuntu 22.04 Jammy
Describe the bug
I updated the timestamp format according to the documentation given. It doesn't print my updated format. It prints the same format as before.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'File' menu
2. Click on 'Preferences'>'Preferences'
3. Under Miscellaneous subsection paste the following timestamp format : "%%%+/%n/%Z/%s/%t/%p/%A/%a/%B/%b/%C/%c/%D/%d/%e/%E/%F/%G/%g/%h/%Y/%m/%d - %H:%M"
4. Close the menu
5. Use default shortcut to paste timestamp : Shift + Alt + M.

[dbwiz]

Some codes don`t work: s, C, D, e, E, F, g, G, t