Touchpad settings disappear after disabled

With a fresh installation of kde plasma, touchpad works fine. For I prefer mouse to touchpad, I disabled touchpad. The problem is that touchpad settings disappear as in the screenshot below.

And if you enable it, does it have options in System Settings?

I could enable it in “System Settings/Input Devices/Touchpad” before, but now it’s empty.

Does it reappear when you unplug the mouse?

After a big update, no problem, treat it as solved.

When I’m trying to test about this, I check the settings first, surprisely the settings appear again as below

I have done nothing about it, it should be self-recoverable or unstable.

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