Bug 429084

SUMMARY
If I lock the screen and click on Switch User, the mouse cursor starts dragging as if it had ice physics, and then if I try to login again, plasma freezes completely on the splash screen. 

STEPS TO REPRODUCE
1. lock the screen
2. select switch user

OBSERVED RESULT
The mouse cursor starts moving weirdly as if it had ice physics. 
TRying to login again hangs plasma.
The login screen looks normal, only the mouse movement is messed up. 
Going to a TTY works. 


SOFTWARE/OS VERSIONS
Operating System: Kubuntu 20.04
KDE Plasma Version: 5.20.3
KDE Frameworks Version: 5.75.0
Qt Version: 5.15.1
Kernel Version: 5.4.0-53-generic
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-3570K CPU @ 3.40GHz
Memory: 7,7 GiB of RAM
Graphics Processor: GeForce GTX 1060 6GB/PCIe/SSE2

ADDITIONAL INFORMATION
I'm not sure what coudl have caused this. Last time I did this, I didn't have this problem. I am using the Nvidia Driver from the PPA updated to 455.38. I'm not sure why System Information says Kubuntu, I'm using KDE Neon.