You could always try the Autohide option or the keep on bottom option and set the delay to short delay, they both seem to work for me

Autohide works very well as soon as I click on something in my dock it goes away immediately.

It must be a Windows Update or something that's affected its behavior, because it's not working as it used to, even if these make-shift workarounds are effective. Regular and Autohide modes still cause the icons to pop up in one way or another. Keep on bottom with short delay still causes the icons to be displayed in front of everything briefly when I mouse over the taskbar (not the icons themselves) which is also undesirable behavior, since I play various games in windowed mode, and I don't need icons randomly thrown in my face if I happen to mouse over a certain part of the screen. All I want is for the dock bars to remain behind everything and never appear in front of any other window, like they used to, and Keep on bottom is presently not working as advertised.