I do can.

But I also have espeaktime installed, which I might see as the cause (maybe).

I will reinstall the stock tklock and see if it is the same with this.

--edit
Call me whatever you like
I rebooted with stock tklock and could not reproduce this behaviour.
After switching back to fmg's verion and a reboot I also could not reproduce this glitch anymore .
What is going on here?
Before I had an uptime of almost 7 days and a few cycles of swap refreshments. Maybe that?

But never mind, this is really not a serious bug. Nevertheless I will have an eye on it and keep you informed.