Simulating Secondary mouse key fails

[niix]

I want to simulate the secondary mouse button via the keyboard.
(By clicking the secondary mouse button, then normally a menu appears.)

So, I opened the Accessibility menu and enabled the option "Mouse Keys".
Additionally, I opened the sub-menu of "Click Assist" and enabled the option "Simulated Secondary Click".
You can see these two configuration options enabled - in the attached image "MouseKeys_SecondaryClick.png".

The following Ubuntu Help page explains it:
https://help.ubuntu.com/stable/ubuntu-help/a11y-right-click.html.en

The actual result:
When continuously clicking the number "5" on the numpad of my keyboard, then it looks like the left mouse button is being clicked repeatedly.

The expected result:
Simulating a click of the right mouse button (for the current location of the mouse pointer).

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Probably this bug is related to either of the following packages:
"gnome-control-center"
or
"xkb-data"

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Details about the system:

Ubuntu 22.04.1 LTS

gnome-control-center/jammy-updates,now 1:41.7-0ubuntu0.22.04.5

xkb-data/jammy,jammy,now 2.33-1 all

[niix (niix)]

Moving the bug report to the package "xkeyboard-config", because I already have an additional bug report with a similar issue and someone there commented that it should be moved to package "xkeyboard-config" - please see:
https://bugs.launchpad.net/ubuntu/+source/xkeyboard-config/+bug/2003581/comments/2