There's definitely part of Explorerpatcher lurking around in there somewhere. MS warned in the update release notes specifically that the update would break explorerpatcher users systems.
Unless the explorerpatcher developer is able to suggest something that may help, here are your options as I see it.
1. Restore an image from prior to last cumulative and attempt removal of explorerpatcher again before reinstalling update.
2. Try system restore if you have a restore point prior to last cumulative and attempt removal of explorerpatcher again before reinstalling update..
3. You can try a repair install which
might work, but I feel like whatever file or registry entry has broken it will still be there with a repair install. Just my opinion here.
This tutorial will show you how to do a repair install of Windows 11 by performing an in-place upgrade without losing anything. If you need to repair or create a new recovery partition or having problems with the Windows 11 operating system on your PC, and the usual solutions will not fix it...
www.elevenforum.com
4. Do a reset and keep files.
A reset removes third party apps. Settings>system>recovery
5. Another option is a custom install. It clean install windows but copies your personal files to windows.old(This option I have not tried. I always backup files and do a clean install. That's just me and my preference)
Custom Install Windows 11 Tutorial
6. Do a clean install.
Clean Install Windows 11 Tutorial
In any case, backup your personal data first. Please consider adjusting to using Windows own start and taskbar configuration. We don't know when an update will affect it again. At first, there were things I didn't like about 11 and I used Start11, but finally decided for me these 3rd party tools were more problem than they were worth. Once you get accustomed to using things the MS way, you don't notice it being a problem any more. You accept it and go on. Keep us posted on what you end up doing. Good luck.