Most of the time, when I hover over an icon in my task bar that has multiple windows open, the thumbnail preview for selecting which window I want doesn't show up. This means that I have to alt+tab to get to any minimized windows. This isn't app specific, it happens with windows explorer and firefox at the same time, so it is the taskbar itself. If I use the Windows taskbar instead, it works fine. Sometimes after rebooting it will also work for a bit then eventually stop working. Clicking on the icon does nothing but the click animation.
On a side note: sometimes the custom background of the start menu and taskbar won't load after said rebooting, but opening the configure menu and going to those settings (I don't have to change anything just open the page) usually fixes this.
Program: Start11 v1.47
OS: Windows 11 22H2 Build 22621.2715
Taskbar position: Top (so the thumbnail would normally display below it), I am not using auto-hide (which I know doesn't work)
Customizations: Left Aligned Custom Start icon, Win11 Style Custom Start Menu Background, Custom Taskbar Background, Always Combine Taskbar Buttons, Medium button size, Show seconds on clock, I believe everything else is the "default"
Let me know if any further information is needed to diagnose this issue.