drawbars

I recently upgraded Win11 to the 2025-09 Update Preview (KB5065789/26100.6725). Since then I am having a problem with StartAllBack 3.9.15 (latest version). If I select Automatic Hiding of the enhanced classic taskbar, the taskbar hides as expected but a new set of taskbar icons appears under the 'real' taskbar, on a transparent background. The indicators for volume, antivirus, etc. on the right hand side are also duplicated. These extra taskbar buttons and indicators will not go away, and they are fully functional. The only solution that I have found is to disable an auto-hidden taskbar. This only happens on the main monitor; secondary taskbars work as expected -- i.e., they disappear when the mouse leaves their area with no leftover items behind the taskbar. I have uninstalled and reinstalled StartAllBack, but this did not change the problem. I have tried disabling the enhanced classic taskbar, restarting Explorer, then re-enabling the feature: this also did not change the problem. Has anyone else seen this? Is there a workaround?