I am getting the below dialog boxes when the computer is locked (and probably asleep). Answers to the questions raised in the Start 11.1 Release Feedback Thread:
Edition: Windows 11 Pro
Version: 21H2
Installed on: 12/12/2021
OS build: 22000.376
Experience Windows Feature Experience Pack: 1000.22000.376.0
update through KB5008215
Version: 1.1
My determination that Start11 is causing the issue is based on this has never happened until after I installed Start11. However, the image below may also help that the error dialogs are associated with Windows Explorer (which, I believe, you hook into).
Additional information:
I write software and have Microsoft Visual Studio installed
I have the software DisplayFusion pro 9.9 installed
images (not taken at the same time):

