Rest assured, you have not broken anything in File Explorer or Task Manager, I see the exact same behaviour after installing that update.
KB5094126 is the start of a new batch of Windows udpates that Microsoft are releasing to make Windows 11 better, more efficient and include new performance boost, they have added low latency profile that changes the way system processes interact with the processor to make many of the Windows processes faster, and that is the most likely cause of the new behaviour you are seeing.