How to reproduce the bug: swipe up / down on the widget screen without taking your finger off of the screen.
After that, the iPhone restarts the Springboard application responsible for the iOS home screen.
Video of Sahib Aliyev.
Apparently, the bug is not found on all iPhones. We managed to call it on the iPhone 11 Pro Max, but on the iPhone 8 Plus there were no problems.
Both smartphones work on iOS 13.1.1. On iOS 13.1 there is no this bug, this bug is also there, judging by the reviews of readers below.
Write in the comments if you managed to repeat the bug. Do not forget to specify the phone model and version of iOS.
Thank you reader Sahib Aliyev for the information.
UPD: Respring is guaranteed to happen if widgets do not occupy the entire screen.