Taskbar Clock does not automatically resize when "Seconds" display is enabled/disabled

livecd-74112-dbg.iso
bootcd-74232-dbg.iso

Case 1:
1.0. Have an horizontal Taskbar.
1.1. Open Taskbar Properties.
1.2. Check "Clock" and (un)check "Seconds". Then Apply.
1.2r. Taskbar Clock will show "Seconds" too, but not resize (expand/shrink).

Workaround:
After time (format) has updated, click on Taskbar, that seems to trigger Clock resizing.

NB:
Take (CORE-12384 and) CORE-12987 into account.

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Case 2: (similar)
2.0. Have an horizontal Taskbar. (Use EN-US locale (format).)
2.1. Open a Command Prompt.
2.2. Execute alternatively 'time 01:01:01' (1:01 AM) and 'time 22:22:22' (10:22 PM).
2.2r. Taskbar Clock will update time, but not resize (expand/shrink).